Its results showed that ratio of length to width of petal and sepal and the degree of flat of achene within population were characterized as the most stable characters and gradually increased with the increase of latitude.

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Sepals 3(or 5); lateral sepals free or connate, margins entire or serrate; lower sepal large, petaloid, usually navicular, funnelform, saccate, or cornute, tapering or abruptly constricted into a nectariferous spur broadly or narrowly filiform, straight, curved, incurved, or ± coiled, swollen at tip, or pointed, rarely 2-lobed, rarely without spur. Petals 5, free, upper petal flat or cucullate, small or large, often crested abaxially, lateral petals free or united in pairs. Stamens 5, alternating with petals, connate or nearly so into a ring surrounding ovary and stigma, falling off in one piece before stigma ripens; filaments short, flat with a scalelike appendage inside; anthers 2-celled, connivent, opening by a slit or pore.

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Petals white or greenish white; flowers at least 15 mm, middle outer sepal and apical appendage of keel cucullate; stems with dense, raised leaf scars and lenticels; leaf blade slightly fleshy, elliptic-obovate to spatulate, 5-6 mm wide, apex obtuse.

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The flower is bisexual, the top gives birth to raceme, the 6-10 that have a flower, collectivity does not have wool, have short peduncular, shape of calyx canister bell, olive, sepal brim has pointed fretsaw to age, leaf pours egg form, white, long make an appointment with 1.5cm, tip is blunt, base the ministry has short claw, staminal 15-20, every 3-4 be born one bundle at flower disc brim, carpel 5, style is detached.

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Corolla tube shorter than sepals; calyx with basal glands only inside sepal edges; leaves without a strong intramarginal vein.

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Sepals caducous after flowering, rarely one outer sepal persistent; keel with apical appendage flabelliform and lobed or laciniate flowers unknown in P. oligosperma

萼片早落花后性视频一区二区在线，宿存的一外部萼片的很少；條裂的龍骨狀具頂端附屬物fmabelliform 和淺裂或(在oligosperma頁花未知) 20

Sepals 6.6-7.8 mm, mucro 1.6-2.5 mm, ratio of mucro/sepal length = 0.22-0.37, outside with 0.1-1.2 mm antrorse to patent nonglandular trichomes, inside glabrous.

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Of them one time was occurred in differentiation of sepal primordium, and itmight be the reason of forming the simple layer of sepal.

其中花瓣原基的分化只進(jìn)行1次自拍偷拍36，這是形成單輪花瓣的原因。

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Scape usually longer than leaves, with 2-3 flowers each with 1bract, floral bract hooded, broad-ovate, as long as ovary, blunt and usually 3-lobed at apex; flower green-yellow, dorsal sepal white with yellow-green veins and green base, elliptic, 4-4.5cm long, short-pointed at apex, keeled on back, pubescent at base inside, petals very long, pendulous, twist, linear, 8.5-12cm long,6mm wide in middle; lip reversed helmet-shaped, longer than dorsal sepal, with claw almost as long as hood, side lobes inflexed, auricles large and nearly broad-triangular; staminode obcordate; stamens with thick and short filaments; ovary rostrate, 5.5cm long, glabrous.

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