MUSTARD FAMILY 63 



Calif oruian herbarium specimen of Douglas. It is significant that the elder Hooker (W. J.), who 

 had most to do with the Douglas plants, does not cite in the Botany of the Beechey a definite lo- 

 cality for a seed plant in the case of Douglas' California material save in two dubious instances. 



6. A. repanda Wats. Yosemite Rock-cress. Stem from a biennial root, li^ 

 to 1% (or 2) feet high, branching above; herbage stellate-pubescent, or the hairs 

 at base simple and longer, the upper parts sometimes subglabrous; basal leaves 

 somewhat rosulate, the blades obovate to oblanceolate, repandly few-toothed, 

 coarsely dentate or nearly entire, narrowed to a commonly short petiole, 2 to 4 

 (or 7) inches long; upper leaves smaller, the blades narrowly oblanceolate or linear; 

 sepal pairs unequal in breadth; petals dull white, narrow, approximate, 2 to 3 lines 

 long, a little exceeding the sepals; pods glabrous, spreading and more or less curved, 

 anastomosely few to several-nerved on the sides, 2i/2 to 4^2 inches long, 1% to 2 

 lines wide, borne on usually stout ascending pedicels 1 to 2 lines long; seeds in one 

 row, elliptical, broadly winged. 



Montane, dry or gravelly slopes, 6000 to 8500 feet : Sierra Nevada from Mari- 

 posa Co. to Tulare Co., thence westerly to the San Emigdio Range and southerly 

 to the San Gabriel and San Jacinto mountains. May, 



Tax. note. — The basal leaves are sometimes a little shaggy and grayish. There is, however, 

 every intergrade to plants with leaves less hairy and green. Both states may be found in plants 

 of lower altitudes. Plants of higher altitudes tend to have greenish leaves. See the variety 

 described below. 



Locs. — Eancheria Mt., Tuolumne Co., Jepson 4588; Yosemite, Jepson 10,449; Horse Corral 

 Mdw., Kings Canon, Jepson 766; Round Mdw., Giant Forest, Jepson 682; Middle Tule River, 

 Purpus 3007; Tehachapi, Greene; Mt. Pinos; Rock Creek, San Gabriel Mts., Peirson 507; Lytle 

 Creek Canon, Mt. San Antonio ; Bear Valley, San Bernardino Mts., Parish 3752 ; South Fork 

 Santa Ana River, Mum 6227; Tahquitz Valley, San Jacinto Mts. 



Var. greenei Jepson nom. n. Plants 7 to 9 inches high; herbage greenish; pods glabrous, 

 shining, finely nerved. — High montane, w. Inyo Co. In 1908 Greene published a high-montane 

 dwarf related to A. platyspermum as A. inamoena (Fedde, Rep. 5:243). In 1911, having for- 

 gotten his previous use of this specific name, he published, as a segregate of A. repanda, a plant 

 with greenish herbage and shining pods from Lake Sebrina on the eastern slope of the Sierra 

 Nevada in Inyo Co., under the name A. inamoena (Lflts. 2:158). It is this latter plant that we 

 are here considering. The pods in the typical form of A. repanda are puberulent, but the pods 

 of plants in Tulare Co. are less puberulent or almost glabrous, though not quite glabrous; some- 

 times the pods are shining. Such characters, in this case, we do not regard as reliably specific. 

 Therefore, A. inamoena Greene (1911), not A. inamoena Greene (1908), is at most of varietal 

 value and we give it the name var. greenei. 



Refs.— Arabis repanda Wats. Proc. Am. Acad. 11:122 (1876), type loc. Yosemite Valley, 

 Bolander 4881; B. & W. Bot. Cal. 1:32 (1876) ; Jepson, Man. 429 (1925). Var. greenei Jepson. 

 A. inamoena Greene, Lflts. 2:158 (1911), type loc. Lake Sebrina, Bishop Creek, Inyo Co., David- 

 son 2729; not A. inamoena Greene (1908). 



7. A. drummondii Gray. Canada Rock-cress. Stems one or few from a bien- 

 nial root-crown, erect, leafy, mostly simple, 1 to 2 feet high ; root-crown simple or 

 sometimes shortly branched; herbage glabrous or a little pubescent below; blades 

 of basal and lower cauline leaves oblanceolate, narrowed below to a petiole, entire, 

 1/2 to 1% inches long; blades of cauline leaves linear-oblanceolate to linear-lance- 

 olate, sessile-sagittate; petals white to rose-color, 3 to 4 lines long; pods erect, 

 crowded, 1% to 2i4 inches long, 1 line wide; seeds narrowly winged, 1 line long. 



Montane"slopes," 5500 to 8000 feet: White Mts.; Sierra Nevada from Madera 

 Co. to Nevada Co. ; thence nw. to Siskiyou Co. East to Rocky Mts., north to Canada. 

 June. 



Tax. note. — Plants with a single stem represent the extreme in habital form of this species 

 but are not at all separable from plants with two to several stems. The cauline leaves are sagit- 

 tate, in the var. alpina commonly not sagittate. Biennial forms intermediate between the species 

 and the perennial var. alpina apparently occur: High Grade district, Modoc Co., L. S. Smith 961 

 (cauline leaves sagittate) ; Mt. Lola, Nevada Co., Hall ^ BahcocTc 4539 (cauline leaves not 

 sagittate or not obviously so). A tall (2 feet high) robust plant collected by Congdon, east of 

 Minarets", is apparently perennial ; it has sagittate cauline leaves. 



