312 PITTONIA. 
sepals, but stamens well exserted: silicles of strongly pyri- 
form outline, small, unevenly crenate, never perforate, the 
scarious margin very narrow or obsolete, the whole body of 
silicle hirtellous. 
Santa Catalina Island, California, March, 1901, Blanche 
Trask. The species has the foliage of T. ramosus of the 
same island and of others of the group, but in mode of 
growth this plant is at the opposite extreme, while the char- 
ters of the pods are very distinctive. 
LEPIDIUM GLAUCUM. Winter annual, erect, 3 to 6 inches 
high, fastigiately branched from below the middle of the 
stem, each branch ending in a slender raceme; herbage 
very glaucous, glabrous except as to pinnate basal leaves, 
these minutely pubescent, their rather remote pinnæ incised: 
flowers very small, both calyx and corolla white; stamens 
apparently 4: pods nearly orbicular, about $ line broad 
emarginate, not margined, glabrous and obscurely lineolate, 
their slender ascending pedicels about 14 or 2 lines long. 
In clayey soil about Mesilla Park, New Mexico, March, 
1900, Theo. D. H. Cockerell. 
DRABA ALBERTINA. Apparently annual or biennial, the 
tuft of radical leaves single, surmounting a slender tap- 
root; flowering stems, many and of equal length, 3 to 6 
inches high, loosely racemose from near the base and naked 
or with a single oblong entire leaf near the base: crowded 
basal leaves less than an inch long, spatulate-linear or 
-oblong, entire very sparingly beset with short, simple or 
forked hairs or even wholly glabrous except as to the setose- 
ciliate margin: base of stems with scattered simple hairs, 
inflorescence glabrous: pods elliptic-oblong, seldom } inch 
long, on ascending pedicels of about equal length or longer: 
style none. 
