APOCYNACEAE 149 



lanceolate : flower 18" broad. — Found as a waif near Sheffield, Courtney 

 and Lee's Summit. August-September. 



3. GBNTIANA L. Gentiast. 

 Calyx usually 5-cleft. Corolla (In ours) funnel-form or salver-form 

 with membranous plaits in the sinuses, l'-2' long. 



Corolla bluish. 



Lobes of corolla spreading. 1 . O. puberula. 



Lobes of corolla connivent. 2. G. Andreiosii. 



Corolla yellowish-white. 3. G. flavida. 



1. G. puberula Michx. Perennial, Vi'-W high : stems puberulent : 

 leaves oblong-lanceolate : corolla bright blue within, greenish without : 

 anthers separate. — Frequent locally on prairies, Hickman's Mills, Lee's 

 Summit, Grain Valley. August-September. 



2. G. Andrewsii Griseb. Perennial, l°-2° high : leaves ovate-lan- 

 ceolate, triple-nerved, rough-margined : corolla light blue, its lobes al- 

 most obsolete : anthers cohering into a tube. — In moist rich woods. 

 Brush Creek, Independence, Sibley. Bare. September. 



3. G. flavida A. Gray. Perennial, 1°-2J° bigh : leaves ovate-lanceo- 

 late, triple-nerved, smooth-margined : flowers nearly 2' long : corolla 

 lobes erect, but not spreading : anthers connivent. — On woody hillsides, 

 Swope Park, Brush Creek, Dodson, Independence. Locally common and 

 occurring in big patches. August-September. 



Family 100. APOCYNACEAE Lindl. 

 Plants with milky juice, entire leaves without stipules, and perfect 

 regular flowers. Divisions of calyx and corolla five each. Stamens five, 

 alternate with the corolla lobes, separate. Pollen granular. Ovary 

 superior, composed of two distinct carpels. Fruit a follicle. 



1. APOCYNUM L. Dogbane. 

 Herbs with opposite leaves and pinkish-white flowers in corymbose 

 cymes. Corolla bell- shaped, bearing five appendages in the throat. Seeds 

 hairy-tufted. 



Corolla lobes revolute. 1. A. ureeolifer. 

 Corolla lobes erect. 



Plant glabrous or sparingly pubescent. 2. A. hypericifolium. 



Plant strongly velvety-pubescent. 3. A. pubeacena. 



1. A. ureeolifer G. S. Miller. 2°-4° high, nearly glabrous through- 

 out : branches divergently forked : leaves ovate, short-petioled : cymes 

 loose : corolla tube exceeding calyx lobes. — In dry soil near Tarsney and 

 Little Blue Tank. Local. June-August. 



2. A. hypericifolium Ait. 2°-5° high : branches erect : lower leaves 

 short-petioled to cordate-clasping, usually cordate at base, oval to oblong : 

 upper leaves petioled : flowers white-pink to greenish-pink. — Abundant 

 in low grounds throughout and very variable. June-September. 



