318 PROCEEDINGS OP THE AMERICAN ACADEMY. 



simple, leafy to the summit, furrowed, springing from large tuberous- 

 tlnckened and clustered roots: leaves 5-6 inches in length, glabrate 

 above, white woolly beneath except upon the nerves, narrowly connate, 

 deeply and palmately cleft into linear attenuate one-nerved spinulose- 

 denticulate segments; the latter 2-3 lines in breadth, with revolute 

 margins : peduncles and involucres densely fuscous-tomentose : heads 

 corymbose, about 6, discoid, an inch in height: scales of the involucre 

 lance-linear ; the outer shorter : corollas yellow, 5-6 lines long ; the 

 tube hirsute: achene silky; pappus tawny, readily deciduous. — Col- 

 lected on bluffs of barrancas, San Marcos, 9 June, 1893 (no. 4398). 

 Near L. Palmeri, Gray, but differing in its arachnoid and not glandu- 

 lar stem, leafy to the summit, its somewhat larger heads and more 

 imbricated involucre, as well as in the more acute segments of the 

 leaves, which in their mode of forking much resemble stag-horns. 



Asclepias Jaliscana. Stem simple or sub-simple, erect, setose- 

 hirsute, a foot in height : leaves sessile, oval to ovate-oblong, with 

 rounded apex, sparingly hirsute upon both surfaces, ciliolate. glaucous 

 beneath : flowers large, greenish, in several pedunculate, rather few- 

 flowered umbels ; peduncles 8 lines to 1 inch long, little exceeding the 

 pedicels ; both hirsute : calyx segments lance-linear, half as long as 

 the corolla lobes ; the latter reflexed, 5 lines in length, purplish upon 

 the lower surface, green upon the uj^per : hoods 2^-3 lines long, 

 scarcely at all auriculate at the inner angles ; horn broad and con- 

 spicuously exserted : fruit tomentose, slender, fusiform. — Collected on 

 the Rio Blanco, Jalisco, by Dr. Edward Palmer, in June, 188G (no. 

 20.) ; then by Mr. Pringle in plains near Guadalajara, June, 1889 (no. 

 3020), and again in dry soil, on plains and hills near the same city, 

 July, 1893 (no. 4444). This species has the pubescence and much 

 of the habit of A. setosa, Benth., with which it has been hitherto con- 

 founded. It is to be distinguished by its broader and more obtuse 

 leaves, more glaucous beneath, its sub-simple stem, and its somewhat 

 larger flowers with scarcely auriculate hoods and broad horns. Hart- 

 weg's no. 213, Bentham's type, as well as a number of other specimens 

 correctly referred to his species, show that in it the horn is relatively 

 slender and the hoods well auricled at the upper inner angles. 



Gonolobus sororics, Gray (Proc. Amer. Acad. xxii. 437), de- 

 scribed from fruiting specimens, is now shown in flower by Mr. 

 Pringle's no. 4435, collected on rocky bluffs above Tequila, 3 July, 

 1893. The following characters may be added: flowers in numerous 

 axillary short-peduncled or subsessile umbels ; pedicels G— 8 lines long: 

 calyx segments lance-linear, obtusish, spreading or reflexed : corolla 



