198 PITTONIA. 
Of the two species concluding this fascicle, the first is a 
segregate of the well known A. platysperma; the other a 
remarkable new species whose affinities can not now be 
designated for want of mature fruit. 
"A.PLATYLOBA. Stems several, 6 to 10 inches high from a 
branched and suffrutescent base: herbage glabrous, scarcely 
glaucescent: basal leaves oblanceolate, acute, entire; cauline 
oblong, sessile by a broad but scarcely auriculate base: 
racemes mostly 2 to 4-flowered: pods erect, 24 inches long, 
21 lines broad; valves not nerved, rather strongly reticu- 
late, the meshes elongated: seeds broadly winged. 
Lake Solfaterro, Lassens Peak, July, 1896, Mrs. Austin. 
Related to A. platysperma, but wholly destitute of the stellate 
pubescence of that species, and with broader leaves and 
pods, larger seeds, etc. 
' A. FORMOSA. Perennial, the one or several very erect 
and simple stems a foot high from a subligneous base; 
whole plant, even to the pods, eanescent with a minute 
stellate indument: lowest leaves narrowly oblanceolate, 14 
inches long including the long rigid petiole, entire; cauline 
rather copious, as long as the others, sessile by a truncate 
but not aurieled base: racemes long and loose, the flesh- 
colored flowers rather more than à inch long, at length 
deflexed: sepals finely and densely stellate; petals with 
spatulate-oblong spreading limb: pods (immature) pen- 
dulous. 
Hills about Aztec, New Mexico, 28 April, 1899, C. F. 
Baker. A handsome and singular-looking Arabis, bearing 
some marks both of Streptanthus and of Thelypodium. 
2. Miscellaneous New Species. 
y CHEIRANTHUS ARIDUS. Biennial and occasionally peren- 
nial, stoutish, rather rigidly erect, the strongly striate stem 
