10. 
(21) 
Polemonium.—Corolla rotate. Stigmas 
3. Filaments inserted at equal heights 
on the tube of the corolla, ascending; 
anthers incumbent. 
Gilia.—Corolla rotate—funnel-shaped. 
Stigmas 3. Filaments straight, inserted 
at equal heights; anthers incumbent. 
Collomia.—Oorolla salver-shaped. Stig- 
mas 3. Filaments inserted at unequal 
heights and exserted. 
Convolvulus.—Corolla funnel-shaped, pli- 
cate, 5-angular. Cells of ovary 2-ovu- 
late. Calyx marcescent. 
Datura.—Corolla funnel-shaped, plicate, 
5-angular. Calyx transversely decidu- 
ous. 
Nicotiana.—Corolla funnel-shaped, pli- 
cate, 5-angular. Calyx persistent. Cells 
of ovary o-ovulate. 
Rhododendron. — Corolla campanulate. 
Stamens inserted on a disc, not on the 
corolla. Cells of the anthers opening 
by pores. Shrubs. 
Pentstemon.—Corolla irregular, funnel- 
shaped. Stamens of unequal length, 
one of them sterile. Capsule 2-celled 
o-ovulate. 
