152 
BRASSIACEAE. 
Petals none or minute, scarcely more than half as long as the sepals, linear or 
linear-spatulate. 
Plant branched at the base; petals often present. 
Axillary racemes very short and dense, usually shorter than the leaves; 
petals more than half as long as the sepals. n. L. ramosissinmm. 
Axillary racemes at last elongated; petals very minute or none. 
12. L. diver gens. 
Plant simple below, branched above; petals none ; racemes elongated. 
13. L. densidorum. 
1. Lepidium spathulatum (Robinson) Vasey. (L. scopulorum spathulatum 
Robinson) In the mountains of Colo.—Between Meeker and Craig; head¬ 
waters of Bear Creek. 
2. Lepidium crenatum (Greene) Rydb. (Thelypodium crenatum Greene) 
In river valleys of Colo, and Utah.—Paonia; Mancos. 
3. Lepidium montanum Nutt. In mountain valleys and on plains from 
Wyo. to Wash., Colo, and Ariz.; also in Mex.—Alt. 7000-10,000 ft.—Pitkin; 
Lake City. 
4. Lepidium alyssoides A. Gray. In river valleys from Colo, to Tex. and 
Ariz.; also in Mex.—Alt. 5000-8000 ft.—Grand Junction; Conejos River, 
north of Antonito; Alamosa. 
5. Lepidium Jonesii Rydb. In mountain valleys of Colo, and Utah.—Alt. 
4000-7000 ft.—Palisades; Grand Junction; Spring Canon; Montrose. 
6. Lepidium Eastwoodiae Wooton. In river valleys of Colo, and N. M.— 
Alt. 5000-9000 ft.—Glenwood Springs; Sangre de Cristo Creek; Pueblo Co. 
7. Lepidium idahoense Heller. In sandy river valley in Ida. and Colo.— 
Alt. up to 7000 ft.—South of Horsetooth Mountain; Spring Canon; foot-hills, 
Larimer Co. 
8. Lepidium virginicum L. In waste places from Que. to Minn., Fla. and 
Tex.—Alt. 7000-10,000 ft.—Along the Conejos River, north of Antonito; 
Horsetooth Gulch; near Pagosa Peak. 
9. Lepidium medium Greene. In waste places and on sandy soil from Mo. 
to Tex. and Calif.—Alt. 5000-7000 ft.—Grand Junction; gulch west of Pen- 
nock’s; Reno; Larimer Co.; plains and foot-hills near Boulder; Lower 
Boulder Canon. 
10. Lepidium ramosum A. Nels. In arid soil from S. D. to Wyo., Colo, 
and Utah.—Alt. up to 10,000 ft.—Vicinity of Como; Wolcott, Eagle Co. 
11. Lepidium ramosissimum A. Nels. In arid soil from Neb. to Wyo. and 
Colo.—Alt. 4000-9000 ft.—Pitkin; plains, Colorado Springs. 
12. Lepidium divergens Osterh. In the mountains of Colo.—Tennessee 
Pass. 
13. Lepidium densiflorum Schrad. (L. apetalum Aschers.; not Willd.; L. 
intermedium A. Gray) In waste places and sandy soil from Me. to Alb., DC. 
and Calif.—Alt. 4000-9000 ft.—Quimby; Ft. Collins; New Windsor, Weld 
Co.; plains, Larimer Co.; Arboles; chaparral-covered hills southeast of 
Ouray; Dix. 
3. THLASPI L. Penny-grass. ' 
Pod orbicular in outline, broadly wing-margined and deeply notched at the apex. 
1. T. arvense. 
Pods obovate or. cuneate in outline, with narrow margins, truncate or slightly 
notched at the apex. 
