474 BOTANICAL GAZETTE [DECEMBER 
mm. long, scarcely twice the length of the green pubescent scarious- 
margined sepals: pods remote on the elongated rachis, white with 
the close pubescence, closely refracted at maturity, only 1-1.5 cm. 
long by 2 mm. broad or nearly that near the base, barely tapering 
to the apex: pedicels 2-3 mm. long: seeds few (2-6), orbicular, 
large, narrowly winged, uniserial or imperfectly biseriate. 
Secured at Jarbridge, Elko County, Nevada, July 4, 1912; the habitat 
not noted. 
* Idahoa, n. n.— Platyspermum Hook. Fl. Bor. Am. 1:68. 1830; 
not Platyspermum Hofimann, Genera Plantarum Umbelliferum 58. 
1814. 
/Idahoa scapigera, n. comb.—Platyspermum scapigerum Hook. 
loc. cit. © 
This peculiar and well known crucifer occurs sparingly in Washington, 
Oregon, and Idaho, but apparently is met with most frequently in western 
Idaho (from the Panhandle to Nevada), hence the choice of name. ; 
’ Lepidium papilliferum, n. comb.—L. montanum papilliferum 
Henderson, Bull. Torr. Bot. Club 27:342. 1900.—Biennial, 
densely papillose-pubescent, especially the stems; intricately 
branched, forming compact spherical clumps, consisting of a central 
stem with numerous lateral branches from its base to a point about 
one-third or one-half the height of the plant, where it in turn 
branches several times: lower leaves pinnatifid, even the upper 
most deeply toothed: racemes short, dense: petals conspicuous, 
twice the length of the sepals: pods on slender, widely spreading, 
often even recurving pedicels, suborbicular, not at all narrowed to 
the notched apex, faintly glutinose-papillose: style well exserted. 
No. 1068, Nampa, Idaho, distributed as L. montanum Nutt. is the type- 
No. 91, New Plymouth, and 880, Emmett, both by MacBrRIDE and distributed 
as L. Jonesii Rydb., are typical. 
L. papilliferum is distinguished at once from the species to which it has been 
referred by its distinctive habit of growth, its merely biennial duration and its 
unusual pubescence. L. montanum and L. Jonesii are perennial, the several 
stems spreading from a branched caudex, the plant possessing no main axis. 
v Lepidium philonitrum, n. sp.—Slender glabrate biennial with a 
slim tap root, 3-4 dm. high, the single sparingly branched stem 
simple below: leaves remote, the lower irregularly pinnate; the 
