ASCLEPIADACE^. (mILKWEED FAMILY.) 397 



■♦i- •»- -1- Stem perfecth) simjile, jnodar.infj onli/ a sim/le conspicuoiislif-pedunclrd ttn'mi- 

 nal umbel of dull-colored lanjlsh (tj" lo)i(j) flowers: hoods and lulies of the co- 

 rolla broad : jiods smooth : whole plant (jlubrous or neurlij so, and pale or f/luu- 

 cous : leaves closely sessile, transversely veiny. 



10. A. obtUSifdlia, Michx. Stem tall (2° -3° high); leaves wavy, oblong 

 with a heart-shaped clasping base, very obtuse or retuse (2^' -5' long) ; peduncle 

 3' -12' long; corolla pale greenish purple; hoods of the crown truncate and 

 somewhat toothed at the summit, shorter than tl)e slender awl-pointcd horn. — 

 Sandy woods and fields : not rare, especially southward. 



11. A. Meadii, Torr. (in Ed. 2, addend.) Stem slender (l°-2° high); 

 leaves ovate or obloug-ovute, not wavy, obtuse or acutish (H'-25' long) ; peduncle 

 only twice the length of the upper leaves ; pedicels rather short; corolla green- 

 ish-white ; hoods of the crown rounded-truncate at summit, and with a sharp 

 tooth at each margin, somewhat exceeding the stouter horn ; pod unknown. — 

 Augusta, Illinois, Dr. S. B. Mead. Clinton, Iowa, Dr. Vascy. June. 



-1- -I- -i- -1- Stem simple or mostly so (2° -4° high), bearing 2-5 panicltd umbels on 

 a naked terminal peduncle, and sometimes single axillary ones : flowers pink-red, 

 rather large (over G" long) : crown conspicuously elevated above the base of the 

 corolla : pods smooth : whole plant glabrous or nearly so. 



12. A. rilbra, L. Leaves ovate or lanceolate and tapering from a rounded or 

 heart-shaped base to a very acute point, sessile or nearly so (2' -6' long, j'-2^' 

 ■wide), bright green ; umbels many-flowered ; divisions of the corolla and hoods 

 of the crown oblong-lanceolate, purple-red ; the horn long and slender. (A. lauri- 

 folia, Michx. A. acuminata, Pursh.) — Wet pine-barrens, «&-c., New Jersey and 

 Penn. to Virginia and southward. 



13. A. pauperoula, Michx. Stem slender (2° -4° high); leaves don- 

 gated lanceolate or linear (5' -10' long), tapering to both ends, slightly petioled; 

 umbels 5 - l2-floiierfd ; divisions of the red corolla narroivly ohlong ; the bright orange 

 hoods broadly oblong, obtuse, much exceeding the incurved liorn. — Wet pine-bar- 

 rens on the coast. New Jersey, Virginia, and southward. 



* * Leaves scattered, or some opposite: milky juice little or none: flowers orange-red. 



14. A. tuberbsa, L. (Butterfly-weed. Pleurisy-root.) Rough- 

 ish-hairy ; stems erect or ascending, very leafy, branching at the summit, and 

 bearing the umbels in a terminal corymb ; leaves varying from linear to oblong- 

 lanceolate, sessile or slightly petioled ; divisions of the corolla oblong (greenish- 

 orange) ; hoods of the crown narrowly oblong, bright orange, scarcely longer 

 than the nearly erect and slender awl-shaped horns ; pods hoary. (A. deeiim- 

 bcns, L.) — Dry hills and fields: common, especially southward. — Plant 1°- 

 2° high, leafy, to the summit, usually with numerous and corymbcil sliort- 

 pcdunclcd umbels of showy flowers. 



« « * Leaves nearly all whorled, rardy alUrnatc, croivded : flowers white, small-. 



l->. A. Verticill^ta, L. (Whouled M.) Smoothish; stems slender, 

 simple or sparingly branched, very leafy to the summit ; leaves very narrowly 

 linear, with revolutc margins (2' -3' long, 1" wide), 3-G in a whorl; umbels 

 small, latci-al and terminal ; divisions of the corolla ovate (greenish-white) ; 



