Lesquerella vicina (Brassicaceae), a New Species from the Uncompahgre River Valley in Western Colorado John L. Anderson U.S. Bureau of Land Management, 2015 W. Deer Valley Rd., Phoenix, Arizona 85027, U.S.A. James L. Reveal Department of Plant Biology, University of Maryland, College Park, Maryland 20742-5815, U.S.A. Reed C. RollinsGray Herbarium, Harvard University, 22 Divinity Avenue, Cambridge, Massachusetts 02138, U.S.A.ABSTRACT. Lesquerella vicina (Brassicaceae) isproposed for a perennial with white flowers foundnear Montrose, Colorado. It is most closely relatedto the yellow-flowered L. rectipes, differing addi-tionally by having broader basal leaves. In theMontrose area it grows on Mancos Shale from 6000to 7200 feet at the ecotone between pinyon-juniperwoodland and salt desert scrub. At the lower ele-vation the plants have a more ephemeral growthform, but at the higher elevations the plants arelonger-lived perennials with well-developed caudi-ces.Lesquerella vicina Anderson, Reveal & Rollins, sp. nov. TYPE: U.S.A. Colorado: Montrose Co., on a small flat-topped mesa overlooking the Uncompahgre River just S of 66500 Kinikin Road about 4 air mi. SE of Montrose, on gray-ish white soil atop adobe Mancos Shale asso-ciated with Artemisia, Yucca, and Opuntia at about 6050 ft. elev. in sec. 10, T48N, R9W, 29 June 1995, Reveal 7492 (holotype, GH; is-otypes. BM, BRY, COLO, MARY, MO, NY, RM, TEX, UC, US). Figure 1. A L rectipes folius latioribus et floribus albus differt. Plants first-year flowering perennials lacking awell-developed caudex, older plants with a well-developed caudex, densely pubescent, the foliagegray-green and scabrous; trichomes substipitate,the rays 3-6, slightly fused or less frequently dis-tinct, forked or bifurcate, appressed to spreading;stems (of fruiting plants) 1-2.5 dm long, few to sev-eral, ascending (in flower) or nearly prostrate (infruit), simple; basal leaves rosulate, 2-7 cm long.the blades ovate to rhomboid or rotund, (1)2-3.5cm long, (1)1.5-2.5 cm wide, flat, entire or occa-sionally shallowly repand. narrowing abruptly to the1-3(3.5)-cm-long petiole; cauline leaves (0.7)1-2.5cm long, the blades narrowly elliptic to elliptic,0.7-1.8 cm long, 0.4-0.8 cm wide, flat, entire, nar-rowing gradually to the 0.2-0.5(0.7)-cm-long peti-ole; inflorescences dense, the buds ellipsoid: sepals4-6 mm long, elliptic, lavender under the grayishtrichomes; petals 6-10 mm long, white, often tingedwith lavender without, pale yellow at the base ofeach petal within, glabrous, the blade narrowly spa-thulate and not differentiated into a blade and claw;filaments slender, 4-5.5 mm long; stamens linear,1.2-1.6 mm long; infructescence elongated; pedi-cels (0.4)0.6-1.2 cm long, stout, curved to slightlysigmoid but always ascending; siliques 0.5-0.7 cmlong, subsessile, nearly globose to obovoid, thevalves densely pubescent with spreading trichomeswithout, glabrous within; septum entire, smooth,glabrous, the funicles attached V or less of theirlength; styles 4-6 mm long, glabrous, slender, thestigmas expanded; ovules 4(6) per locule; seeds 2-2.2 mm long, ovate, flattened, orangish brown,faintly margined; cotyledons accumbent. about aslong as the radicle. Lesquerella vicina (from vicinus, neighboring, al-luding to the type locality, near the home of Re-veal's Montrose neighbors Stan Hersh and HazelPollard) is most likely a first-year flowering peren-nial. The spring of 1995 was particularly moist inthe Montrose area, and the specimens collected inlate June of 1995 flowered the first year of theirduration. The plant has not been seen during pre-NOvoN 7: 9-12. 1997.