259 PITTONIA. 
eastern Nevada, July, 1896; perhaps including all the so- 
called P. Parryi of Nevadan alpine heights; but differing 
essentially from that species, as all my specimens show, by 
the foliage, and in a number of significant points: (1) leaves 
more than twice as numerous; (2) narrower and with less 
distinction of blade and petiole; (3) the obtuse and long 
mucronate apex ; (4) the small outermost leaves of the cluster 
being narrowest, the width of leaf increasing toward the 
center of the plant. Exactly the reverse of this is true in 
the related species, where the short outer leaves are rela- 
tively broadest and with distinct blade and petiole, the in- 
nermost being invariably narrowest in proportion to their 
length. 
The plant of Mt. San Francisco in northern Arizona must 
be referred here rather than to P. Parryi; its whole char- 
acter being at agreement with P. mucronata except that it 
lacks the mucronation. I therefore nameit var. ARIZONICA 
of the present species. : 
The Nevadan type is most unlike P. Parryi in its choice 
of a home, for it grows far above timber line, among rocks 
and near snow, in the coldest, bleakest places, while its 
Colorado relative is of sheltered subalpine wet meadows 
amid the forests. 
STUDIES IN THE CRucirFERE.—ll. 
NESODRABA. 
Stoutish acaulescent monopodial perennials, with thick 
perpendicular rootstock crowned by a tuft of rather ample 
leaves; the axils of the outer series producing leafy and ra- 
cemose decumbent peduncles. "Flowers yellow. Sepals equal. 
Pods broad, flattened, somewhat turgid, either rounded or 
elongated. Seedsin two rather widely separated rows under 
each valve, obovate, wingless. Partition of pods thin and 
almost filmy.—Plants of Northwest American coast islands, 
