ORDER 97. ASCLEPIAPS. 



by the middle. Follicles long, slen- 

 der, separate. Seeds with a tuft of 

 long, silky down. Jucne- August. 



I A androsajmifo'lium. Tutsan-leaved D. 

 Corolla rose-white, much longer than 

 the calyx. Leaves ovate. Plant 

 smooth, elegant, about 3f. high. 



Sc A. cannabi'num. Hemp D. Cor. green- 

 ish-white, scarce longer than the 

 calyx. Leaves oblong. Bark tough 

 as hemp. 



Fig. 620. Common DogVbane. 1. A flower 

 of the natural size. 2. The flower cut open, 

 showing the peculiar stamens. 3. The 2 styles 

 and stigmas. 4 The plan of tne flower. 5. Tho 

 2 follicles. 6. A seed with its tuft of silk. 



ORDER XCYII. ASCLEPIADACE^E. Asclepiads. 



Plants (chiefly herls in the United States) with a milky juice ; 

 leaves opposite (rarely whorlod or scattered), entire, without stipules; 

 flowers generally umbeled, 5-parted, regular ; sepals and also the 

 petals united at base, both commonly valvate in the bud ; 

 stamens united into a fleshy mass with the two stigmas ; 

 pollen cohering in masses ; ovaries 2, forming follicles in fruit 



Analysis of the Genera. 



Plants erect. Stamen-mass crowned with 5 little hoods. . . .2 

 Plants twining or prostrate. . . .8 



2 Hoods each with a little projecting horn. . . .a 



2 Hoods destitute of horns b 



3 Flowers dark purple c 



3 Flowers whitish or flesh-colored 



1 Petals reflexed. Hoods erect, horns incurved. Silkgrass. Milkweed. ASCLK'PIAS. 

 b Petals reflexed. Hoods erect, adnate to the anthers. ACKRA'TES. 



b Petals spreading, green. Hoods free from the anthers. S. ANAN'THERIX. 

 b Potals erect, yellowiah. Mass of anthers stalked. S. PODOSTIO'MA 



