CENUS I. 



MILKWEED FAMILY. 



27 



7. Asclepias pulchra Ehrh. Hairy Milk- 

 weed. Fig. 3389. 



Asclepias pulchra Ehrh.; Willd. Sp. PI. i : 1267. 1798. 

 A. incarnata var. pulchra Pers. Syn. i : 276. 1805. 



Similar to the preceding species and perhaps hy- 

 bridizing with it where the two grow together ; 

 stem stout, tomentose-pubescent, usually branched, 

 2-3i high, leafy to the top. Leaves broadly lan- 

 ceolate, acute, acuminate or some of them obtusish 

 at the apex, subcordate, rounded, or the upper nar- 

 rowed at the base, puberulent or glabrous above, 

 pubescent, at least on the veins beneath, 3' -5' long, 

 i'-2' wide ; petioles usually stout and short ; flowers 

 similar to those of A. incarnata, but the corolla 

 commonly lighter red or pink, rarely white; pedun- 

 cles and pedicels tomentose; fruiting pedicels erect 

 or incurved; follicles erect, densely pubescent, 2'-3' 

 long. 



In moist fields and swamps, Nova Scotia to Minne- 

 sota, south to Georgia. White Indian-hemp. July-Sept. 



8. Asclepias Sullivantii Engelm. Sulli- 

 vant's Milkweed. Fig. 3390. 



A. Sullivantii Engelm.; A. Gray, Man. 366. 1848. 



Glabrous throughout ; stem stout, simple or 

 sometimes branched above, 2-4 high, leafy to 

 the top. Leaves thick, sessile, or on petioles less 

 than i" long, oblong or ovate-oblong, usually 

 obtuse and mucronulate at the apex, subcordate, 

 rounded or slightly clasping at the base, 4'-6' 

 long, iJ'-3' wide, the primary nerves very wide- 

 spreading; umbels terminal and sometimes also 

 in the upper axils, many-flowered; peduncles 

 shorter than the leaves; corolla-segments oval- 

 oblong, s"-6" long, purplish ; column very short 

 and thick; hoods oval, obtuse or truncate, gib- 

 bous at each side near the base, longer than the 

 anthers and the subulate incurved horn ; follicles 

 erect, glabrous, 3'~4' long, usually with blunt 

 processes near the apex. 



In moist soil, southern Ontario to Ohio, Minne- 

 sota, Nebraska, Missouri and Kansas. July-Sept. 



9. Asclepias latifolia (Torr.) Raf. Broad-leaved Milkweed. Fig. 3391. 



Asclepias obtusifolia var. latifolia Torr. Ann. Lye. N. Y. 

 2 : 117. 1826. 



Asclepias latifolia Raf. Atl. Journ. 146. 1832-33. 

 A. Jamesii Torr. Bot. Mex. Bound. Surv. 162. 1859. 



Minutely puberulent wnen young, glabrous when 

 old ; stem stout, usually simple, l-22 high, very 

 leafy. Leaves very thick, oval to orbicular, sessile 

 or nearly so, commonly broadly emarginate and 

 mucronulate at the apex and cordate or subcordate 

 at the base, 4'-6' long and nearly as wide, primary 

 nerves very wide-spreading; umbels 2-4, many- 

 flowered, short-peduncled in the upper axils or rarely 

 terminal; pedicels slender, canescent, nearly i' long; 

 corolla-segments ovate, acute, 4"-6" long, greenish ; 

 column short and thick; hoods truncate, about equal- 

 ling the anthers, the horn projecting from a short 

 crest over the edge of the stigma ; follicles erect on 

 deflexed pedicels, ovoid, acutish, 2'-3' long, about i' 

 thick. 



On dry plains, Nebraska to Colorado, Texas and Ari- 

 zona. July-Sept. 



