64 



CRUCIFERAE 



Locs. — White Mts., Shocklcy 500; upper San Joaquin River, Madera Co., Congdon; Ranche- 

 ria Mt., Yoscmitc Park, Jepson 4584 ; Deer Park, Placer Co., Davy 3247 ; Summit sta., Nevada 

 Co., Jepson 13,343 ; Lop Lake, Shackelford Creek, Siskiyou Co., Butler 123, 1G64. 



Var alpina Wats. St^^nis slender, several from tlio slender branches of a loosely branched 

 perennial rootcrowni, \i> to 5 (or sometimes 12) inches high; herbage glabrous, rarely puberulent 

 below ; blades of basal leaves oblanceolate, narrowed below to a petiole, entire or rarely few- 

 toothed, 5 to 13 lines long; blades of cauline leaves linear or lanceolate, sessile, commonly not 

 sagittate; petals purple, 1^,^ to 3 lines long; pods ascending or erect, IVt to 2 inches long. — 

 Loamy or sandy soil, 8000 to 11,600 feet: Sierra Nevada from Inyo Co. and Tulare Co. to Modoc 

 Co. North to British Columbia; east to Montana and Utah. June- July. 



Tax. note. — W^hilc Watson's original description of Arabis lyallii calls for sagittate cauline 

 leaves, these are only occasionally sagittate. Examples of sagittate leaves may be found in plants 

 from Elkhorn Mt., Mont., T. Brandegee, and Mt. Rainier, Wash., 0. D. Allen 299, but not in the 

 California specimens cited below, though plants mth sagittate leaves may be expected. 



Locs. — Little Kern River, Tulare Co., Purpus 1815; Rock Creek, near Mt. Whitney, Jepson 

 5059a; Yosemite Park, Jepson 3305 (Mt. Dana), 4561 (Macomb Ridge), 4551 (Tower Peak); 

 Mt. Bidwell, Jepson 7893. 



Refs. — Arabis drummondii Gray, Proc. Am. Acad. 6:187 (1864). Turritis stricta Graham, 

 Edinb. N. Phil. Jour. 7 :350 (1829), type loc. n. Rocky Mts., Drummond. Var. alpina Wats. Bot. 

 King 18 (1871), type loc. w. Nevada.' A. lyallii Wats. Proc. Am. Acad. 11:122 (1876). A drvm- 

 mondi var. lyallii Jepson, Man. 429 (1925). 



8. A. cognata Jepson. Lady Rock-cress. Stems slender, few to many, 2 to 

 4 inches high, ascending from a very stout and densely scaly perennial root-crown 

 3 to 12 lines broad; herbage glabrous; basal leaves with oblanceolate blades tapering 

 gradually to a slender petiole as long or longer than the blade, % to 2 inches long, 

 2 to 3 lines wide; cauline leaves few and small (the blades obovate, sessile) or some- 

 times none; flowers rose-purple, 3^/2 lines long; fruiting pedicels slender, 3 to 7 

 lines long; pods spreading or ascending, % to 1% inches long, 1 line wide; seeds 

 winged at apex, I/2 line long. 



Montane, 5700 to 7800 feet : Sierra Nevada from Mariposa Co. to Plumas Co. 



Locs. — ^Near Yosemite, Hall ^ Babcock 3436 ; Mt. Elwell, Plumas Co. 



Ref. — Arabis cognata Jepson, Man. 429 (1925), type loc. Mt. Elwell, C. M. Wilder. 



9. A. lemmonii Wats. Soldier Rock- 

 cress. (Fig. 137.) Stems few to many from 

 a branched perennial crown, 3 to 9 inches 

 high; herbage pubescent, occasionally glabrous 

 above; blades of lower leaves spatulate to ob- 

 lanceolate, narrowed to a petiole, the whole 3 

 to 6 or 8 lines long, covered with a fine close 

 pubescence or even whitish felt, the hairs short 

 with the branches rebranched; flowers light 

 purple, 2 to 3 lines long; pods glabrous, 1 to 1^/^ 

 inches long, widely spreading or recurved; ped- 

 icels glabrous. 



Rocky places, 6000 to 11,000 feet: White 

 Mts.; Sierra Nevada from Tulare and Inyo 

 Cos. to Shasta and Siskiyou Cos. North to 

 British Columbia, east to Montana and Wyo- 

 ming. May-June. It is very near A. breweri 

 in habit and character, but the stems are more 

 slender and the leaves grayer. 



Locs. — White Mts.: North Fork Crooked Creek, 

 Jepson 7278, 7300 ; Big Prospector Mdw., Jepson 7334. 

 Sierra Nevada: Olancha Peak; Farewell Gap, Jepson 

 1016, 1036; Timosea Peak, Inyo Co., Jepson 5079; 

 Kaiser Peak, Jepson 13,019 (pedicels pubescent) ; 

 Lundy Trail, Mt. Warren, Congdon; Mt. Dana, Jepson 



Fig. 137. Arabis lemmonii Wats. 

 a, habit, X % ; &, epidermal hair, X 90 ; 

 c, fl., X 21^ ; d, pod, X%;e, seed, X 7. 



