98 ASCLEPIADACE.E. Asclepias. 



3. Column none. 



A. cinerea, "Walt. Glabrous or nearly so : stem very slender, a foot or two high : leaves 

 all opposite, spreading, very narrowly linear (1 to 3 inches long, half to a line wide); 

 umbels terminal and sub terminal at the naked summit of the stem, loosely 5-7-flowered : 

 filiform drooping pedicels longer than the peduncle : corolla dull purplish outside, ash-color 

 within ; the lobes tardily reflexed, oval, 3 lines long : hoods considerably shorter than the 

 anthers, broader than high, truncate at the back, the involute inner angles extended in a 

 triangular acute ascending lobe, which exceeds the broad triangular horn. Car. 105; 

 Ell. Sk. i. 325 ; Chapm. 1. c. Low pine barrens, S. Carolina to Florida. 



b. Corolla and calyx merely rotately spreading, not reflexed. 



A. Feayi, Chapm. Stem filiform, erect, a foot or two high : leaves all opposite, in 4 to 

 6 pairs, spreading, linear-filiform (2 to 4 inches long, barely half a line wide), glabrous, of ten 

 wanting above at the 2 or 3 approximate short-peduncled 3-5-flowered umbels : corolla 

 white ; the lobes oblong or at length narrower, 3 or 4 lines long : column none : hoods white 

 and petaloid except a thickish midrib, barely as long as the sagittate-based anthers, spread- 

 ing, concave, entire ; in place of horn a semioval entire crest or plate adnate to the middle 

 of the back within : follicles not seen. Gray, Proc. Am. Acad. xii. 72. Tampa, Florida, 

 Leavemvorth (in herb. Torr.), Dr. Feay, Dr. Garbcr. 



2. PODOSTEMMA, Gray. Hoods long-stipitate, their stalks adnate to nearly 

 the whole length of the antheriferous column, surpassing the anthers ; the crest- 

 like process adnate to the nearly open lamina : anther-wings broader and some- 

 what angulate about the middle : umbels all lateral. Proc. Am. Acad. xii. 72. 



A. longicornu, Benth. A span to a foot or more high, minutely and somewhat hir- 

 sutely pubescent: leaves all opposite, from ovate to oblong-lanceolate, obtuse, 2 to 4 inches 

 long, petioled : umbels short-peduncled or nearly sessile, several-many-flowered : flowers 

 yellowish-green : corolla-lobes a fourth to half inch long, oblong : hoods with stalk-like 

 portion twice the length of the gradually dilated whitish somewhat 2-3-lobed or toothed 

 lamina; the process infra-apical and divided into 2 short subulate and fleshy horns ; the 

 exterior horn barely equalling the apex of the hood ; the inner twice longer, incurved and 

 somewhat exserted : follicles arrect on the deflexed pedicel, ovate-oblong, acuminate, at 

 first canescent or pubescent or roughish. PI. Hartw. 24 ; Decaisne, 1. c. 570. A. Lindlieimeri, 

 Engelm. & Gray, PI. Lindh. ii. 42. Texas and New Mexico. (Mex., Nicaragua.) 



3. NOTIIA CERATES, Gray. Anther-wings widening to the broadly rounded 

 base and conspicuously auriculate-notched just above it : hoods sessile, with a 

 narrow wholly adnate internal crest terminating in a minute horn : habit of 

 Acerates : pollinia short and thick, arcuate-obovate. 



A. stenophylla, Gray. Puberulent, but foliage glabrous : stems slender, a foot or two 

 high, simple: leaves long and narrowly linear (3 to 7 inches long, 1 to 2i lines wide), with 

 scabrous and more or less revolute margins and a strong midrib ; the upper alternate and 

 the lower opposite : umbels several, short-peduncled or subsessile, 10-15-flowered : pedicels 

 about twice the length of the greenish flowers : corolla-lobes oblong, 2 lines long : column 

 very short : hoods whitish, erect, equalling the anthers, oblong, conduplicate-concave, the 

 base of each inner margin appendaged by a cuneate erosely truncate lobe, the apex 

 2-lobed and the narrow internal crest exserted in the sinus in the form of an intermediate 

 tooth : interior crown of 5 very small 2-lobed processes between the bases of the anthers : 

 follicles slender-fusiform and long-acuminate, erect on the ascending pedicel. Proc. Am. 

 Acad. xii. 72. Polyotus angustifolius, Nutt. in Trans. Am. Phil. Soc. ser. 2, v. 201. Acerates 

 anrjnsfifiilia, Pecaisne, 1. c. 522. Dry prairies, W. Arkansas and N. Texas to Nebraska and 

 Colorado. Connecting link between Asclepias and Acerates. 



7. ACERATES, Ell. (Formed of , privative, and XSQCIS, a horn.) At- 

 lantic U. S. perennial herbs, resembling Asclepias ; with comparatively small 

 flowers greenish or barely tinged with purple, in summer. Umbels many-flowered, 

 sessile or short-peduncled. Distinguished only by the total absence of horn or 



