ASCLEPIADACEJ?. 2^3 



10. A. VERTICILLATA, L. Whorled Milkweed. 



Smoothish; stems slender, simple or sparingly brauehed. minut-dy lv aryjnlineg, 

 vary laafy to the summit; leaves mostly whorled, narrow-linear, revolute on thu 

 tttargin; utnbels small lateral and terminal; hoods of the crown roundish-oval, 

 half as long as the hooked ciaw-shaped horns. 



Dry hills. Jan — Sept. St» m 1 to 3 fe6t high, very slender, often *Ktie branched 

 st the summit. Leaves '-' to "• inches long, scarcely 1 line wide. 3 to in a whorl, or 

 the lowest and upp sfmost nearly opposite. Flowers small,, greenish-white, in nu- 

 merous umbels about 1 inch in diameter. 



Ac rates, Ell. LToodsof the crown destitute rf a horn ; whence the name, freni 

 a, privative arid Ui\<s,-at< s. a horn. 



11. A. yiridiflora, Ra£ Green-flowered Mil I- weed. 



Downy-hoary; stems low and stout, ascending; leaves oval, ovate and obovatc or 

 somdhnrs almost linear, slightly petiolcd; mutronate| acute or ohtos?, thick, at 

 length sraoplhish; umbels nearly sessile, densely rai'.ny-f.owcrrd, j»] bose, lateral ; 

 trown oblong, strictly erect, sessile at the base of the tube of filaments, shorter 

 than the anthe; ^. 



Pry hills and "sandy fields, eommon. July — Sept. Stern 12 to 13 inches h'gb, 

 p>:n times clustered. Leaves 2 to 3 inches long, thick and coriaceous; very variable 

 in form. Umbels 'I to 4. subterminal on short thick hairy peduncles. FLw.rs 

 greMLh, when expanded about the length of the pedicel, 



2. GOXOLOBUS, Michx. 



Gr. gonos. an angle, and Lbos, a pod, from the ribbed follislee. 



Calyx 5-parfccd, spreading. Corolla 5-parted, wlieel- 



shaped, sometimes reflcxed-spreading. Crov/n a small and 

 fleshy wavy-iobed ring in the throat cf tile corolla. Anthers 

 horizontal, partly concealed under the flattened stigma, 

 opening transversely. Pollen-masses 5 pairs, horizontal. 



Follicles 2, turgid, somewhat ribbed. Seeds comose. 



Twining herbaceous or shrubby plants, rciiJi opposite heart-shaped 

 leaves, usually hairy, and raeemed or cerymbed greenish or puiplUh 

 Jlowers, on peduncles rising froai between the petioles. . 



1. G. UIRSUTUS, Michx. Hairy GonoJolus. 



Minutely pubescent; leaves ovate heart-shaped, somewhat obtuse or pointed; w- 

 djn:ks fjw-flowered s shorter than the petioles; pedicels very short; bractltte aw]- 

 shape.1 ; lobes of the corolla oblong minutely so tly-hairy outside ; foUides covered 

 with spine-like soft processes. 



Rich river banks. Western part of the Statar June, July. Stent trailing art! 

 climbing 3 to 4 feet long, the younger hjaneb.es very hairy. Leaves slightly aurica- 

 late at baso. Umbels axillary, 3 to 4-fldTvered. Flowers dark purple. 



2. G-. macropiitllus, Michx. Lnreje-lcavcd Gonohlus. 



Stem hirsute with long hairs; leaves broadly ovate-heart-shaped, pointed; je- 

 duncles and pedicels longer than the petioles; bractlets linear; loles of the corolla 

 linear or narrowly oblong, downy outside; follicles ribbed and angled. 



Shady hanks, near Philadelphia. Barton. Chester Co., Darlington. July. Sl$m 

 twining several feet long. Leaves C to 6 inehc3 wide. Flowers purple and green, 

 iih, fjjtid, in loose cymose umbela. 



J2* 



