ROBINSON AND GREENMAN.— GENUS POROPHYLLUM. 33 
d-nerved, slightly reticulated, 2 inches long, 2 to 2} lines broad, entire ; 
marginal glands elliptical, usually 2 or 3 on each side and often one at 
the end of each leaf: heads 6 to 8 lines long, 25-30-flowered, rather 
densely clustered in terminal flat-topped leafy cymose corymbs (2 or 3 
inches in breadth); individual peduncles shorter than the heads: scales 
of the cylindrical involucre 5, oblong, obtuse or rounded at the apex, 5 
lines long, 1 to 1} lines broad, pale green, with a double line of dark 
linear glands near the middle: flowers white. — P. Seemanni, Wats. 
roc. Am, Acad. xxiv. 57; Brandegee, Zoe, i. 313; not Schz. Bip. — 
Collected by Dr. Edward Palmer in crevices of exposed rocks in high 
mountains near Guaymas, Sonora, 1887, no. 279 (distributed as Yi 
Seemannii, var.). According to Dr. Palmer’s notes the plant is called 
Maravilla by the Mexicans and used for headache. 
+ + Mexican species with corolla more deeply cleft and more or less distinctly 
bilabiate ; teeth lanceolate ; achenes 24 to 3} lines in length. 
++ Achenes long and slender, tapering at the apex, about 4 lines long. 
19. P. gracile, Benth. Leaves fleshy, subterete. — Bot. Sulph. 29. 
ar ti, sp.? aff. P. gracile. Leaves not fleshy, flat, very nar rowly 
lance-linear, 1 to 2 inches long, a lipe or two broad, with regular margt- 
™ glands: heads solitary, terminal on very short slender peduncles : 
cylindrical involucre green, slender; scales with purple border and glands. 
—A tall slender, much branched leafy plant collected at Fronteras, 
Sonora, by C. V. Hartman, altitude 4,550 feet, 25 September, 1890, no. 8. 
“+ ++ Achenes shorter, 2 to 3 lines long: involucre very dark-purple, often 
pruinose-glaucous. 
= Spreading annuals: very likely a single species. 
21. P, coloratum, DC. Prodr. v. 650. 
22. P, tagetoides, DC. 1. c. 
= = Perennials, a little shrubby at the base. 
a. Involucral scales obovate, very broad and obtuse. 
= 5. filifolium, Gray, Proc. Am. Acad. xviii. 107, xix. 35. 
6. Involucral scales narrower, oblong. 
24, P. Linaria, DC. 1. c. 649. 
“+ + Lower Californian shrubs, with geniculate and much branched stems, 
short subulate fleshy leaves, and short many-flowered heads: achenes only 
1} lines in length. 
25. P. crassifoli iv. 57 
; - £. crassifolium, Wats. Proc. Am. Acad. xxiv. 57. 
6. P. tridentatum, Benth. Bot. Sulph. 30. 
VOL, Xxxy7, — 3 
