RypBerG: Srupies ON THE Rocky Mountain Frora 235 
Thlaspi Nuttallii 
Thlaspi cochleariforme Nutt. Journ. Acad. Phila. '7: 13. 1834. 
Not DC. 1821. 
This species has been merged in 7. a/pestre, but none of our 
American forms belong to that species. 7. Nuétallii is inter- 
mediate between 7. parzflorum A. Nelson and 7. glaucum A. 
Nelson, having larger flowers than the former and smaller than 
the latter. The pod is obovate, rounded at the apex with a narrow 
sinus. In Z. g/aucum the sinus is broad and open. 
YRoripa clavata sp. nov. 
Biennial, tall, perfectly glabrous : stem 6-10 dm. high, simple 
up to the inflorescence: leaves lyrate-pinnatifid, 5-10 cm. long, 
more or less auricled at the base ; lobes 4—8 pairs, oblong to ovate, 
obtuse or acute, broadly dentate : inflorescence branched ; petioles 
in fruit 5-10 mm. long, divaricate: petals spatulate, about 3 mm. 
long, exceeding the sepals : pod 10-12 mm. long, 2.5—3 mm. thick, 
decidedly clavate, obtuse, strongly curved ; style nearly 1 mm. long. 
This may have been included in Watson’s Nasturtium terrestre 
Var. occidentale ; but the name occidentale cannot be used as there 
is already another older Roripa occidentalis Greene. It is not, 
however, Roripa Pacifica Howell, which is supposed to be a syno- 
nym of Watson’s variety, for that species is described as being 
slightly pubescent and having pods which are acute at both ends, 
while in R. clavata the pod is almost truncate at the apex. 
WasuINGTOon : Hogeman, Chehalis county, 1897, Frank H. 
Lamb, 1221 (type in herb. N. Y. Bot. Gard.); West Klickitat 
county, 1885, W. MW. Suksdorf. 
OrEGon : Sauvie's Island, 1888, 7. Howell, 1333. 
British Cocumpia : Port Henry, 1889, /ohn Macoun. 
IpaHo: Near Hope, Kootenai county, 1892, Sandberg, Mac- 
Dougal & Heller, 1029, at least in part. : 
‘Roripa Underwoodii sp. nov. 
Biennial, divaricately branched, even near the ground, perfectly 
S'abrous ; stems 2 dm. or more high : leaves 3-5 cm. long, lyrately 
_ Pinnatifid, thin; lobes oblong, obtuse ; the terminal one elliptic 
at : to. broadly oval, sinuately toothed ; petioles short, winged and 
