midvein

Stomatal apparatuses are oval, and the long axes of stomata are mostly perpendicular or oblique to the midvein.

Petals broadly obovate, white, rarely pinkish or purplish, midvein yellow or yellow-green, base cuneate, with an inflexed apex.

Leaf blade sometimes folded, base slightly broadened, margin cartilaginous, apex acuminate, midvein scabrous.

leaf blade lanceolate or oblong, with several pairs of longitudinal veins parallel to a distinct midvein.

Leaf blade without an obvious midvein but with many, slender, longitudinal veins dichotomous in basal region and converging toward apex.

Inflorescences umbels, sessile, borne on midvein of leaf blade, rarely on petiole of leaves on upper part of young branches.

Leaves basal, tufted, grasslike, lanceolate to linear, with a conspicuous midvein.

Leaves pectinate-pinnatifid, with up to 11 lobes on each side of midvein; stigma prominently 2-lobed, lobes subdecurrent.

Petals yellow, outer reddish-tinged, ovate, midvein elevated on both surfaces, apex narrowly inflexed.

Leaf blade secondary veins 6-8 on each side of midvein, apex acute and with a retuse tip.

A prominent, simple vein or rib of a leaf. See illustration for midvein.

bracts lanceolate, margin and midvein sparsely hirtellous, apex long acuminate.

inner ones with purple midvein, sometimes slightly longer than outer ones, apex acute, shortly pointed.

Corolla tubular-campanulate; leaf with fine veins inconspicuous on both surfaces; abaxially densely floccose towards base on midvein.

41 (40) Leaflet blades abaxially pubescent at least on midvein toward base or secondary veins.

Leaf blade margin conspicuously serrate, crenate serrate, or sparsely serrate, midvein adaxially raised.

Sepals lanceolate to ovate-lanceolate, 3-veined, midvein raised, lateral veins not obvious, margin white membranous, apex acute.

Leaves petiolate; leaf blade usually membranous, secondary veins 4 on each side of midvein, tertiary veins parallel, margin dentate.

Petiolule and midvein of blade densely yellow pubescent, without fine prickles.

Leaf blade with only midvein and lateral veins pubescent abaxially; male pedicels, sepals outside, and capsules glabrous.

Style deeply lobed, ca. as long as ovary; young leaf blade obovate to obovate-oblong, rarely oblanceolate, abaxially comose along midvein.

Inflorescences axillary, sometimes borne on petiole or leaf midvein.

upper lemma lanceolate, midvein produced into mucro or poorly developed short awn.

Leaf blade abaxially pubescent along midvein. Bracts ovate-oblong or ovate, both surfaces pilose or glabrous distally.

Leaf blade oblong-elliptic, adaxially pubescent along midvein, apex abruptly acute to shortly acuminate.

Branchlets nearly glabrous; adaxial surface of leaf blade glabrous except on midvein; inflorescences minutely puberulent.

Fruit with prominent midvein and two lateral veins, widest at middle, light brown.

leaf blade pubescent, secondary veins 2 on each side of midvein, tertiary veins numerous and parallel, margin entire.

floral bracts obovate, occasionally crested along midvein, glabrous or abaxially with some short hairs.

Stellate hairs of leaf blade abaxial midvein without long central rays.

Buds, petioles, young leaves, midvein adaxially and mature leaves puberulent.

Leaves abaxially rusty tomentose on midvein and lateral veins to throughout entire surface.

lateral veins ca. 30 pairs, nearly at a right angle to midvein, flattened on both surfaces.

lobes linear-lanceolate, 8-10 mm, margin ciliolate, apex acuminate, midvein outside strongly keeled and decurrent into wings of calyx tube.

lateral veins numerous, subparallel, almost at a right angle to midvein.

Leaflet blades abaxially densely tomentose, adaxially hairy only on midvein and lateral veins, base broadly cuneate to rounded.

midvein prominent abaxially, concave adaxially, without evident lateral veins.

Leaves petiolate; leaf blade stiffly papery to sometimes membranous, secondary veins 2 or 3 on each side of midvein, margin denticulate.

Leaves petiolate; leaf blade ovate to oblong, secondary veins 1 on each side of midvein, margin entire.

Perianth white; segments with pale red midvein.

leaf blade usually pubescent, secondary veins 1-3 on each side of midvein, tertiary veins numerous and parallel, margin entire.

Leaf blade secondary veins 12-20 on each side of midvein; rudimentary gynoecium in male flowers entire or nearly so; petals reflexed.

midvein thick, obviously prominent on both surfaces, secondary veins 6-8 pairs, anastomosing at margin.

Leaf margin serrate apically, entire basally, abaxially pubescent only along midvein when young; peduncle and pedicels glabrous.

lateral lobes 1-6 on each side of midvein, much smaller than terminal one, entire, repand, or dentate, sometimes absent.

Leaf blade secondary veins 15-25 on each side of midvein, reticulate veins abaxially conspicuous; petiole usually less than 1 cm.

basal lateral veins long, secondary veins 5-7 on each side of midvein, reticulate venation clearly defined in dry leaf.

Branches stout. Leaves alternate, lateral veins 20-30 pairs, diverging almost at right angles to midvein.

Tepals tinged pale green-yellow along midvein abaxially.

2 (1) Buds, leaflet blade abaxially along midvein, and inflorescence sparsely pubescent or rust-brown pubescent, glabrescent.

Flowers small. Sepals 5, margin hyaline, midvein raised abaxially into rounded fleshy keel.

secondary veins 6-10 on each side of midvein, extending to margin, each ending in a tooth.

Leaves in whorls of 3, midvein prominent abaxially, lateral veins numerous, parallel.

Leaves leathery, adaxially glabrous except on midvein and lateral veins; 2 inner petals bifid to half.

lobes lanceolate, equal, ca. 3 cm. Lateral staminodes rhombic, 1. 7--2. 5 cm, midvein weak, base narrowed into a claw.

basal lateral veins short, secondary veins 10-12 on each side of midvein, tertiary veins honeycomb like.

Capsule obconical, 8-12 mm, base acute to narrowly cuneate; leaf blade abaxially usually densely pubescent along both sides of midvein.

basal lateral veins short, secondary veins 8-12 on each side of midvein, conspicuous on both surfaces.

Midvein of bracteoles spiny, long excurrent; an herb or a shrub.

Leaf blade of all young leaves and midvein of mature leaves adaxially puberulent.

basal lateral veins short, secondary veins 5-7 on each side of midvein, oblique to near margin then looped.

Leaf blade oblong, secondary veins 20-28 on each side of midvein; sepals oblong to ovate-oblong, thick.

basal lateral veins expanded, secondary veins 5-7 on each side of midvein, raised on both surfaces.

Leaf blade abaxially sparsely glandular setose on midvein, with 3 basal glands per side.

basal lateral veins short, secondary veins 5-8 on each side of midvein, and abaxially prominent, tertiary veins reticulate.

Branchlets and midvein of leaflet blades abaxially with prickles.

Leaf blade abaxially white to pale grayish brown, base rounded; veins conspicuous; secondary veins 6-8 on each side of midvein.

midvein prominent on both surfaces, secondary veins 7-11 pairs, straight, or apically slightly curved and closed.

Leaf blade abaxially subglabrous, or sparsely puberulous only along midvein and lateral veins.

wax gland solitary, abaxially at base of midvein.

Branchlets terete; leaf blade elliptic to obovate, secondary veins 12-15 on each side of midvein; peduncle terete.

basal lateral veins with red glands in axils, secondary veins red, 3 or 4 on each side of midvein.

midvein prominent abaxially, secondary veins 7-11 pairs, oblique, straight, not obvious.

Leaf blade lanceolate, always entire, secondary veins 8-18 on each side of midvein.

Labellum with yellow midvein striped red, oblong, 2--3 cm, white pubescent.

secondary veins 7-10 on each side of midvein, basally straight, curved upward and anastomosing before margin.

lobes by fusion appearing 3, unequal, posterior one triangular, ca. 0. 8 mm, villous along midvein and ciliate.

Branchlets dark brown; leaf blade with 6-9 secondary veins on each side of midvein; figs with apex slightly sunken.

Leaves linear, usually longer than scape, 2--5 mm wide, midvein obscure.

Leaflet blade secondary veins 11-14 on each side of midvein, margin entire; ovules 2 per carpel, collateral.

lateral veins 8-11 on each side of midvein, white downy later, only veins pilose, or abaxially more pubescent.

midvein flat to impressed adaxially, lateral veins 4-9 pairs, tertiary veins reticulate.

basal lateral veins elongated, secondary veins 5 or 6 on each side of midvein, abaxially prominent.

secondary veins 13-15 on each side of midvein, adaxially slightly raised, fusing at serration.

lobes oblong to ovate, 2-2. 5 mm, margin membranous, apex obtuse and cuspidate, midvein crested.

Leaf blade spatulate-linear to linear, 2-7 mm wide, abaxially with few bristles along midvein only.

3 (2) Leaf blades oblong to lanceolate, abaxially sparsely pilose along midvein.

6 (5) Leaf blade margin entire, midvein adaxially slightly impressed.

basal lateral veins short, secondary veins 7-15 on each side of midvein, and apically curved.

Lateral sepals 2, broadly ovate, rarely orbicular, 0. 8-1 cm, apex acuminate, abaxial midvein narrowly carinate.

3 (2) Petiolule and midvein of blade with fine prickles.

secondary veins 20-28 on each side of midvein or rarely fewer.

bracts lanceolate, ca. 4 mm, membranous, with brown midvein, 2- or 3-flowered.

midvein impressed adaxially, lateral veins (7-)9-11 pairs, tertiary veins mainly per current.

Lateral sepals 2, green, orbicular, 1-1. 5 cm in diam. , apex acuminate, abaxial midvein fine, turgid.

midvein prominent adaxially, strigose, lateral veins 8-10 per side, netted ca. 2 mm apart from margin.

Branchlets 1-3 mm in diam. ; leaves nearly membranous when dry, sparsely hispidulous, midvein sparsely pilose, petiole 2-3 cm.

4 (3) Leaf blade base oblique or symmetrically deeply cordate, secondary veins usually (2-)4(or 5) on each side of midvein.

Petiole 2. 5-3 cm; leaf blade papery, abaxially pilose along midvein.

3 (2) Leaflet blade secondary veins 13-22 on each side of midvein, margin crenulate or rarely entire; ovules 2 per carpel, subcollateral.

Leaflets 9-13, alternate to subopposite; leaflet blades 5-15 cm, secondary veins 12-16 on each side of midvein; panicles grayish lepidote.

3 (2) Leaves subsessile, leaf blade pubescent only along sides of midvein abaxially, ligule 2--4 mm.

valves obscurely veined or with a prominent, narrowly winged midvein, keeled or not;

valves with a prominent midvein and often distinct marginal veins, glabrous or glandular, torulose;

valves papery, with a prominent midvein and distinct lateral veins, glabrous, torulose;

septum complete, translucent or opaque, veinless or with a distinct midvein;

Leaves simple, palmately lobed or appearing almost palmately compound, with a fanlike base and lobes constricted to midvein, margin serrate;

valves with a prominent midvein, smooth or torulose;

secondary veins usually prominent, numerous to few, oblique to perpendicular to midvein;

Leaf blade secondary veins obviously anastomosing into an intramarginal vein in each side of midvein;

valves glabrous, smooth, with obscure midvein and marginal veins, obtuse at base, acute at apex;

Leaf blade secondary veins not anastomosing into an intramarginal vein in each side of midvein;

Sepals blue-purple, abaxially sparsely puberulent along midvein;

leaflets with midvein never sulcate adaxially and margin flat to slightly recurved;

Glumes greenish, ovate-oblong, 3- or 4-veined, glabrous, or scabrous along midvein distally, apex acuminate or pointed;

Glumes ovate-lanceolate, 3- or 4-veined, glabrous but scabrous along midvein distally, apex acute;

Upper petal orbicular, 6-8 mm in diam. , cucullate, abaxial midvein narrowly cristate at middle;

secondary veins 12-15 on each side of midvein, abruptly curving near margin, apical ones often fusing;

glumes glabrous, smooth or midvein scabrid;

Upper petal orbicular or broadly obovate, 1-1. 3 cm, apex retuse, abaxial midvein thickened, broadly triangular cristate;

leaf blade papery, abaxially glabrous, with barbed hairs on midvein, adaxially green and glabrous, 3-foliolate;

Inflorescences axillary or at base of leaf midvein, erect, racemes, 1(or 2)-flowered;

Tepals unequal, outer 2 lanceolate, ca. 5 mm, 3-veined below, rigid after anthesis, midvein stretching into spines;

midvein marked. Inflorescences terminal, widely spaced, to 10-15 cm in fruit, becoming racemelike;

secondary veins 10-13 on each side of midvein, ramified near margin but rarely fusing;

Upper petal orbicular, ca. 1. 2 cm in diam. , apex retuse, abaxial midvein fine, apically slightly thickened;

secondary veins 8-11 on each side of midvein, sometimes ramified near margin;

secondary veins 10-14 on each side of midvein, often fusing at serration;

Upper petal broadly elliptic or obovate, 1. 4-1. 6 cm, membranous, apex cuspidate, abaxial midvein slightly thickened;

secondary veins 11-14 on each side of midvein, adaxially slightly impressed, abruptly curving apically near margin but not fusing;

Upper petal orbicular or oblate, 1-1. 5 cm in diam. , apex mucronulate, abaxial midvein not thickened;

Leaf blade oblong-elliptic, 7-15 cm, secondary veins 11-13 on each side of midvein, reticulate veins adaxially impressed, base cuneate;

segments oblong, abaxially with distinct midvein and winged from proximal middle part in fruit;

1 (0) Leaf blade elliptic, 7-10 cm, midvein adaxially proximally slightly raised, flattened or subimpressed toward distal half;