272 CONTEIBUTIONS FEOM THE NATIONAL HERBAEIUM. 



3. Lepidium alyssoides A. Gray, Mem. Amer. Acad. n. ser. 4: 18. 1849. 



Type locality: "Mountain valleys, from Santa Fe eastward to Rabbit's Ear 

 Creek," New Mexico. Type collected by Fendler (no. 46). 



Range: Colorado to Texas and Arizona. 



New Mexico: Common nearly everywhere from the Pecos River westward across 

 the State. Plains and hills, in the Lower and Upper Sonoran zones. 



Nearly related to the last, but as seen growing it is noticeably yellowish green, the 

 flowers are not so bright a white, the leaves are narrower, and the basal ones are 

 less divided. 



4. Lepidium apetalum Willd. Sp. PI. 3: 439. 1800. 

 Type locality: "In Siberia." 



Range: British Columbia and New England, southward throughout the United 

 Stat3s; also in Asia; probably introduced in New Mexico. 

 New Mexico: Aztec; Agricidtural College; Santa Fe; Pajarito Park. 



5. Lepidium medium Greene, Erythea 3: 36. 1895. 



Lepidium intermedium A. Gray, PI. Wright. 2: 15. 1853, not A. Rich. 1847. 



Type locality: Ravines of the Organ Mountains, New Mexico. Type collected 

 by Wright (no. 1320). 



Range: Missouri and Texas to California. 



New Mexico: Rio Pueblo; Sandia Mountains; Mangas Springs; Mimbres River; 

 Florida Mountains; Mesilla Valley; Organ Mountains. Plains and hills, in the Lower 

 and Upper Sonoran zones, rarely extending into the Transition. 



6. Lepidium hirsutum Rydb. Bull. Torrey Club 39: 322. 1913. 



Lepidium intermedium pubescens Greene, Bot. Gaz. 5: 157. 1881, not L. pubescens 

 Desv. 1814. 



Lepidium medium pubescens Robinson in A. Gray, Syn. Fl. 1^: 127. 1895. 



Type locality: Mangas Springs, New Mexico. Type collected by E. L. Greene, 

 in 1880. 



Range: Southwestern New Mexico and adjacent Arizona. 



New Mexico: Farmington; Chama; Winsors Ranch; Bear Mountain; Middle Fork 

 of the Gila; Cliff; Pecos. Dry hillsides. 



7. Lepidium lasiocarpumi Nutt.; Torr. & Gray, Fl. N. Amer. 1: 115. 1838. 

 Lepidium wrightii A. Gray, PL Wright. 2: 15. 1853. 



Type locality: "Near St. Barbara, Upper California." 



Range: Washington to California and Texas. 



New Mexico: Carrizo Mountains; Farmington; Upper Corner Monument; Mesilla 

 Valley; Tortugas Mountain; Organ Mountains. Dry fields, in the LoAver and Upper 

 Sonoran zones. 



A low, spreading, mora or less hirsute annual or winter annual, with stout divergent 

 stems, pinnatidd leaves, and inconspicuous flowers followed quickly by the numerous 

 somewhat crowded silicles. It is one of the few true "spring flowers" of the southern 

 part of the State. Often it is a weed in irrigated land. 



14. THLASPI L. Penny cress. 



Low annuals or perennials with a rosette of oblanceolate-spatulate leaves with few 

 teeth; cauline leaves clasping; flowers white, purple- tinged, rather large for the fam- 

 ily, 5 to 7 mm. long; siliques obovate to almost obcordate; style slender, remaining 

 on the persistent septum. 



