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ones sessile; flowers whitish or purplish. — Niles 

 Station. Summer. 



3. A. Mexicana Cav. Follicles glabrous; 

 erect on erect pedicels; umbels oo-flowered; 

 peduncles longer than the pedicels; flowers 

 whitish. — Alameda on marshy places. Sum- 

 mer. 



Family 2. APOCYNACKSl. 



Stamens not monadelphous. Anthers in- 

 trose. Corolla contorted in aestivation and its 

 lobes oblique. Lactescent. 



1. Apocynum. Tourn. Dog-bane. Indian hemp. 



Corolla companulate, 5-cleft, with 5 scales 

 opposite the lobes and near their base. Sta- 

 mens inserted on the base of the corolla. Fil- 

 aments very short. Anthers sagitate, conniving 

 into a ring. Ovaries 2, with 5, hypogynous 

 scales. Fruit 2-follicular. Seeds with a hairy 

 arillus. — 21- 



1. A. ANDROS.EMiFOLiUM L. Cymes loose; 

 corolla campanulate; tube longer than the 

 calyx-lobes; corolla lobes revolute; flowers 

 flesh-color. — Livermore. Summer. Bare. (Dog- 

 bane.) 



2. A. CANNABiNUM L. Cymes dense, com- 

 pact; corolla tube not longer than the calyx- 

 lobes; corolla lobes almost erect; flowers pale. 

 Alvarado, on marshy places; very local. Sum- 



6a 



