742 FLORA. 



4. Asclepias rubra L. Red Milkweed. (I. F. f. 2903.) Nearly glabrous; 

 stem usually simple, 3-12 dm. high. Leaves opposite, rather distant, short-petioled, 

 rounded or subcordate at the base, gradually acuminate, rather firm, 1-2 dm. long, 

 the primary nerves wide-spreading; umbels 1-4, many-flowered; peduncles shorter 

 than or equalling the upper leaves; pedicels slender, downy; corolla purplish red, 

 or the hoods orange-red, 6-9 nun. long; horns of the hoods very slender, nearly 

 straight; fruiting pedicels deflexed, the follicles erect, spindle-shaped, glabrous, 

 about I dm. long. Moist soil, N. J. and Penn. to Ha., La. and Tex. June-July. 



5. Asclepias purpurascens L. Purple Milkweed. (I. F. f. 2904.) Stem 

 stout, puberulent or glabrous, usually simple, 6-12 dm. high, leafy to the top. 

 Leaves petioled, mucronulate, nearly glabrous above, finely tomentose beneath. 8 - 

 20 cm. long, the primary nerves wide-spreading; umbels many-flowered; peduncles 

 stout; pedicels slender, puberulent; corolla deep purple, its segments oblong, about 

 6 mm. long; hoods nearly twice as long as the anthers, pale red or purple, the horns 

 broad at the insertion, short-subulate and incurved at the apex; fruiting pedicels 

 deflexed, the downy follicles nearly erect 10-13 cm. long. In dry fields and 

 thickets, Mass. to Va., Ont., Minn, and Kans. June-Aug. [A. amocna L. ?] 



6. Asclepias incarnata L. Swamp Milkweed. (I. F. f. 2905.) Stem 

 slender, 6-12 dm. high, leafy to the top. Leaves acuminate, 8-15 cm. long, the 

 primary nerves not wide-spreading; umbels usually numerous, many-flowered; 

 pedicels pubescent; corolla red or rose-purple, rarely white, its lobes oblong, about 

 4 mm. long; horns incurved, longer than the hoods, obtuse, pink or purplish; 

 anther-wings entire, or obscurely notched at the base; fruiting pedicels erect or 

 incurved; follicles erect, 5-9 cm. long, sparingly puberulent. In swamps, N. B. to 

 the N. W. Terr., Tenn., La. and Kans. July-Sept. 



7. Asclepias pulchra Ehrh. Hairy Milkweed. (I. F. f. 2906.) Similar 

 to the preceding; stem stout, tomentose -pubescent, 6-10 dm. high, leafy to the top. 

 Leaves acute, acuminate or some of them obtusish, pubescent, at least on the veins 

 beneath, 7-13 cm. long; petioles usually short; flowers similar to those of A. incar- 

 nata, but the corolla commonly lighter red or pink, rarely white; peduncles and 

 pedicels tomentose; fruiting pedicels erect or incurved; follicles erect, finely and 

 densely pubescent, 5-8 cm. long. In moist fields and swamps, Me. to Minn, and 

 Ga. July-Sept. 



8. Asclepias Sullivantii Engelm. Sullivant's Milkweed. (I. F. f. 2907.) 

 Stem stout, 6-12 dm. high, leafy to the top. Leaves thick, oblong or ovate- 

 oblong, usually obtuse and mucronulate at the apex, subcordate, rounded or 

 slightly clasping at the base, 10-15 cm. long, 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, 11-13 mm. long, 

 purplish; hoods oval, obtuse or truncate, longer than the anthers and the subulate 

 incurved horn; follicles erect, glabrous, 8-10 cm. long, usually with blunt processes 

 near the apex. In moist soil, Ohio to Minn., Neb., Mo. and Kans. July-Sept. 



9. Asclepias latifolia (Torr. ) Raf. Broad-leaved Milkweed. (I. F. f. 

 2908.) Stem stout, usually simple, 3-7 dm. high, very leafy. Leaves very thick, 

 oval to orbicular, commonly broadly emarginate and mucronulate at the apex and 

 cordate or subcordate at the base, 10-15 cm. 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; corolla-segments ovate, 

 acute, 9-13 mm. long, greenish; hoods about equalling the anthers, the horn pro- 

 jecting from a short crest over the edge of the stigma; follicles erect on deflexed 

 pedicels, ovoid, acutish, 5-8 cm. long, about 2.5 mm. thick. On dry plains, 

 Neb. to Colo., Tex. and Ariz. July-Sept. 



10. Asclepias amplexicaulis J. E. Smith. Blunt-leaved Milkweed 

 (I. F. f. 2909.) Nearly glabrous, pale green, somewhat glaucous; stem erect o» 

 ascending, 6-9 dm. high. Leaves oblong or ovate-oblong, obtuse and mucronu. 

 late, 8-13 cm. long; primary nerves wide-spreading; umbel many-flowered, rarely 

 with :i second shorter-peduncled one at it- base; pedicels slender, downy, about 

 2.5 cm. long; corolla segments oblong, greenish purple, about 9 mm. long; hoods 

 pink, nearly truncate and toothed at the summit, shorter than the subulate 

 incurved horn; follicles erect on the stout decurved fruiting pedicels, downy, 



