Cressa. 759 
usually 2-celled, 4-ovuled. Styles 2 or single 
and bifid. Fruit a capsule with generally 
valvular dehiscence, 1—4-seeded. — Herbs 
or shrubs; stems prostrate, erect or climbing. 
1. Stamens and style exserted. ... . ei ponvdleY CrORSa. 
2. Stamens and style not exserted. - ... 2%. Seddera. 
b) Tribe II: Convolouleae. — Flowers axillary, 
solitary or dichasial. Sepals free, rarely 
accrescent. Corolla funnel-shaped, subentire ; 
midpetaline areas not well defined; aestivation 
contorto-plicate. Stamens and style included. 
Filaments dilated at the base and glandular 
hairy. Ovary 2-celled, 4-ovuled. Style long, 
entire. Fruit a valvate capsule, 2-celled, 
4-seeded, rarely with opercular or irregular 
dehiscence or indehiscent. 
1. Flowers subtended by a pair of large 
foliaceous Lats heren beni cincast eckson Calysteria- 
2. Flowers not thus subtended .... . . 4. Convoloulus. 
II. Pollen grains spinose. 
a) Tribe Ill: ZIpomoeeae. — Flowers axillary, 
solitary or in few- to many-flowered cymes, 
often large and showy. Sepals sometimes 
much enlarged in fruit. Corolla generally 
funnel-shaped, sometimes more or _ less 
campanulate, hypocrateriform or urceolate: 
midpetaline areas well defined; aestivation 
contorto-plicate. Stamens and styles included, 
or sometimes exserted. Filaments with dilated 
glandular-hairy base. Ovary generally 2-celied 
and 4-ovuled. Style simple; stigma capitate, 
entire or bilobed, rarely oblong. Fruit gene- 
rally a 4-valved capsule. ...... . =. 5. Ipomoea. 
b. Parasitic plants with filiform leafless stems . . . . 6. Cuseuta. 
433. (1.) Cressa Linn. 
Sepals coriaceous, obovate, subequal, imbricate. Corolla-tube 
campanulate; lobes ovate, imbricate in bud, spreading. Stamens and 
styles exserted; filaments filiform, glabrous; anthers oblong. Disk 
inconspicuous. Ovary 2-celled, 4-ovuled; styles distinct from the 
base; stigmas capitate. Capsule 2—4-valved, usually 1-seeded. 
Seed glabrous, shining; cotyledons linear, plicate. — A much-branched, ° 
lowgrowing, suffrutescent perennial. Leaves small, entire, sessile. 
