367 
Flora of the Malayan Peninsula. 
distinct. Calyx 2-parbite ; lobes entire or nearly so, often accrescent. 
Corolla 2-lipped ; upper lip entire or emarginate ; lower larger 
3-6-lobed ; tube with a straight or curved spur. Stamens 2, adnate to 
base of corolla, alternate with lobes of lower lip ; filaments broad ; 
anthers ovate, 2-celled, or by confluence almost 1-celled. Carpels 
connate in a globose 1-celled ovary ; ovules many, on a central 
placenta ; style short ; stigma unequally 2-lobed. Capsule globose, 
regularly 2-1-valved, or opening irregularly. Seeds many, small; 
albumen 0. — Distkib. Species 150, in most countries. 
Leaves many, submerged, scattered, divided into numerous capil- 
lary segments mostly interspersed with bladders ; calyx-lobes 
equal or nearly so ; pedicels not winged : — 
Flowers yellow to pale-yellow or nearly white : — 
Peduncles very slender ; flowers usually two, never more 
than three, always under -25 in. across ; pedicels in fruit 
erect : sometimes the capillary leaves absent . . 1. 17. exoleta. 
Peduncles stout ; flowers usually more than three, and 
always from -35 to -5 in. across ; pedicels reflexed in fruit 
and thickened under the calyx .. .. ..2. TJ.flexuosa. 
Flowers blue or red or pink ; pedicels erect in fruit . . 3. 17. punctata. 
Leaves few, rosulate at base of stem : — 
Leaves linear or linear-spathulate, usually absent at time of 
flowering ; calyx-lobes equal or nearly so ; seeds not glochi- 
5. 
U. affinis 
vae. Griffithii. 
diate : — 
Scales of the scape and bracts attached by their bases : — 
Stems erect : — 
Flowers yellow ; pedicels in fruit distinctly winged .. 4. U. bifida. 
Flowers pink, purple, or violet, rarely white with lilac 
markings : — 
Pedicels in fruit slightly winged ; sometimes a few 
leaves still present at time of flowering ; stems 8 to 
12 in. high, stoutish 
Pedicels in fruit capillary, short, wingless; leaves 0 
at time of flowering ; stems 2 to 3 in. high, very 
slender . . . . . . .. 6. U. minutissima. 
Stems twining ; flowers yellow : — 
Stems slender, leaves absent at time of flowering ; lower 
lip less than - 25 in. wide . . . . . . 7. 
Stems stouter ; leaves forming matted masses ; lower 
lip over -3 in. wide . . . . . . . . 8. 
Scales of the scape and bracts produced downward below 
point of attachment : — - 
Flowers on distinct pedicels as long as the fruiting calyx 
or longer ; capsule longer than fruiting calyx-lobes ; flowers 
pink ( Ridley ) .. .. .. . . 9. U. verticillata. 
Flowers almost or quite sessile ; capsule hidden by the 
fruiting calyx-lobes : — 
Flowers few, scattered on the very slender scapes ; ) 10. Z7. racemosa 
corolla white . . . . ... • ■ f vae. filicaulis. 
IJ. Wallichiana. 
V. involvens. 
