Utricularia. 895 
Stamens 2, anticous, attached to the base of the corolla, slightly 
converging in front of the stigma; filaments short, usually curved 
and asvmmetrically thickened; anthers 2-celled; cells diverging, con- 
fluent, dehiscing by a common slit. Ovary superior, l-celled; carpels 2, 
median; style simple, short or very short; stigma more or less 
distinctly 2-lipped, upper lip usually very small or obscure; placenta 
free central ovoid or globose, rarely reduced to a short basal pro- 
tuberance, ovules numerous, sessile and closely packed, rarely few 
or only 2, anatropous. Fruit a 1-celled, few to-many seeded cap- 
sule, dehiscing irregularly or by 2—4 valves or circumscissile, very 
rarely one-seeded and indehiscent. Seeds very small, variously 
shaped; testa thin or spongy or corky, rarely exuding mucilage; 
endosperm 0; embryo undifferentiated or with obscure protuberances 
(rudiments of the primary leaves) at the often flat or slightly con- 
cave apex, rarely with a plumule of subulate primary leaves or a 
distinct cotyledon. — Perennial, rarely annual herbs, aquatic or 
terrestrial (but always in wet places), with peculiar, usually utricular, 
contrivances for the capture and digestion of small organisms. 
Leaves rosulate or scattered on stolons, entire or divided, uniform 
or sometimes heteromorphic. Inflorescences terminal or axillary, 
peduncled, racemose, simple, rarely sparingly branched, bracteate; 
lowest bracts usually barren, adpressed; bracteoles 2 or 0 at the 
base of the pedicels; flowers very small to large, often showy, yellow, 
purple or blue. 
Species about 200, in all parts of the World. 
510. Utricularia Linn. 
Sepals 2, free or united at the base, persistent and frequently 
enlarged in fruit, equal or slightly unequal. Corolla 2-lipped 
spurred or rarely saccate; upper lip erect entire or emarginate to 
bifid; lower lip usually much larger than the upper, usually with 
a vaulted, often much raised and 2-gibbous palate and a spreading 
or deflexed entire, crenulate or lobed margin. Stamens 2; filaments 
almost straight or curved, short, often winged on the outer side; 
anthers dorsifixed, cells subdistinct or quite confluent; pollen globose, 
or depressed-globose, with or without few to many longitudinal slits 
and several pores. Ovary more or less globose, 1-celled;. style 
distinct, short, persistent; stigma 2-lipped anticous lobe much 
larger than the often obscure posticous; ovules numerous, rarely 
few, sessile on the free central fleshy placenta, anatropous. Capsule 
usually globose, breaking up into 2 valves or dehiscing irregularly. 
Seeds globose, ovoid, lenticular, hemi-elliptic, truncate-pyramidal or 
prismatic, smooth, reticulate, tubercled, glochidiate or variously 
