208 American Midland Naturalist Monograph No. 2 



coma; dry woods, chiefly in w. and s. III. May-June 



A. quadrijolia Jacq. 



11. Flowers white; leaves all opposite; seeds usually without a 



coma; wet ground in woods, rare. June-Aug 



A. pereimis Walt. 



9. Fruiting pedicels deflexed; corolla-lobes 6-8 mm. long. 



12. Umbel loose, the pedicels drooping, 2.5-5 cm. long; leaves thin, 

 elliptic-lanceolate, acuminate; corolla-lobes obtusish, greenish, 

 the hoods white or pink; stem 1-1.5 cm. tall; woods. June- 

 July. Poke Milkweed {A. exaltata (L.) Muhl.J 



A. phytolaccoides Pursh 



12. Umbel compact, the pedicels erect or ascending, 1-2 cm. long; 

 leaves oval, firm, obtuse and mucronate, or acute; corolla- 

 lobes white, acute, the hoods purplish; stem 30-90 cm. tall; 

 sandy soil, not common; s. 111., extending northw. to Wabash 



and St. Clair counties. June-July. White Milkweed 



- A. variegata L. 



2. Acerates Ell. — Green Milkweed 



1. Umbel solitary, terminal; plants hirsute; leaves lanceolate, acutish; stem 10- 

 30 cm. tall; dry ground, n. 111., rare. June-Aug A. lanuginosa Nutt. 



1. Umbels several; plants puberulent or glabrate; stem 30-90 cm. tall. 



2. Umbels peduncled; leaves alternate, linear-lanceolate, acuminate; hoods 

 entire; roadsides and fields. July- Aug. [_A. floridana of auth., not 



(Lam.) Hitchc] -A. htrtella Pennell 



2. Umbels sessile; leaves chiefly opposite. 



3. Leaves lanceolate; umbels many-flowered; pedicels pubescent; hoods 



entire; roadsides and fields, local. June-Aug 



A. viridi flora (Raf.) Eaton 



3. Leaves linear; umbels 10-15-flowered; pedicels puberulent; hoods 3- 

 toothed; dry upland woods, Quincy, Adams Co., Rev. R. Brinker 

 3495 [Asclepias stenophylla Gray] A. angustifolia (Nutt.) Dec. 



3. ASCLEPIODORA Gray 



A. viridis (Walt.) Gray. Dry soil, s.w. 111., not common; known from 

 Randolph, Perry, and Marion counties. June-July. 



4. Ampelamus Raf. 



A. albidus (Nutt.) Britt. Bluevine. River banks and thickets, or along 

 fences, chiefly in the s. half of the state, but extending northw. at least to Pike 

 and Champaign counties. July-Aug. [^Gonolobus laevis sensu auth., non Michx.j 



5. GoNOl.OBUS Michx. — Climbing Milkweed 



{() do nlo.'tie l^liana Alexander) 



1. Flowers greenish yellow; pedicels glabrous; follicles angular, smooth, gla- 

 brous; along fences and in open woods. June-July. [V^incetoxicum gono- 

 carpoi Walt.} G. gonocarpos (Walt.) Perry 



