WOOTON AND STANDLEY—FLORA OF NEW MEXICO. 271 
12. CARDARIA Desv. Hoary cress. 
1. Cardaria draba (L.) Desv. Journ. de Bot. 3: 163. 1813. 
Lepidium draba L. Sp. Pl. 645. 1753. 
Type Locauity: ‘‘ Habitat in Germania, praesertim Austria, Gallia, Italia.’’ 
New Mexico: Mesilla Valley. 
An introduced weed having the appearance of a Lepidium, but the pods ovate- 
cordate, acute at the apex. It probably occurs elsewhere in the State, since the seeds 
are often distributed with those of garden or field crops or with grass seeds. It has 
been well established in the Mesilla Valley in alfalfa fields for several years. 
13. LEPIDIUM L. PrEprprercrass. 
Herbaceous annuals or short-lived perennials with pinnatifid or simple leaves; 
flowers of medium or small size (in one of our species apetalous), with white petals, 
in crowded racemes, these elongating in fruit; stamens often fewer than 6; siliques 
orbicular or oblong, strongly flattened contrary to the septum, dehiscent, sometimes 
wing-margined; seeds flattened, solitary in each valve. 
KEY TO THE SPECIES. 
Style conspicuous, equaling or exceeding the wing margins of the 
fruit. 
Stems pubescent throughout; all the cauline leaves pinnatifid. 1. L. thurbert. 
Stems glabrous, at least below; upper cauline leaves entire. 
Branches of the inflorescence pubescent; lower cauline 
leaves pinnatifid, the upper linear-oblong........ 2. L. eastwoodiae. 
Branches of the inflorescence glabrous; all the cauline 
leaves entire, linear..............2....222.---2-- 3. L. alyssoides. 
Style obsolete, at least much shorter than the wing margins of the 
fruit. 
Petals wanting..................2 2.022202 eee eee eee eee 4, L. apetalum. 
Petals present. 
Stems and leaves glabrous except sometimes below. 
(Plants bright green.)..............2.2...2222004- 5. L. medium. 
Stems and leaves pubescent. 
Fruit glabrous; stems puberulent, erect....-.---..... 6. L. hirsutum. . 
Fruit pubescent; stems villous, spreading..........-. 7. DL. lasiocarpum. 
1. Lepidium thurberi Wooton, Bull. Torrey Club 25: 259. 1898. 
TypE Locality: Lava, New Mexico. Type collected by Wooton (no. 672). 
RANGE: Southwestern New Mexico to Arizona. 
New Mexico: Lava; Cienaga Ranch; Silver City; Dog Spring; near White Water; 
Hatchet Ranch; Reserve. Upper Sonoran Zone. 
2. Lepidium eastwoodiae Wooton, Bull. Torrey Club 25: 258. 1898. 
TypE Locauity: Mescalero Agency, White Mountains, New Mexico. Type col- 
lected by Wooton. 
Rance: New Mexico and southern Colorado. 
New Mexico: Farmington; Chama; Cerrillos; Sandia Mountains; Gallinas Moun- 
tains; Galisteo; Organ Mountains; Sacramento and White mountains. Mountains, in 
the Upper Sonoran and Transition zones. 
A common plant in the mountains of the central and southern parts of the State. 
It is a short-lived perennial corymbosely branched above, with numerous racemes of 
bright white flowers. The foliage is of a rather pronounced green (rarely yellowish 
green), and the lower leaves are pinnately divided, the upper leaves simple, oblong- 
lanceolate, flat. 
