306 



LEGUMINOSAE 



Refs. — Trifolium howelli Wats. Proc. Am. Acad. 23:262 (1888), type loc. Siskiyou Mts., 

 8. Ore., noucU; McDcr. N. Am. Sp. Trifolium 265, pi. 110 (1910) ; Jepson, Man. 544 (1925). 



30. T. beckwithii Brew. Plumas Clover. (Fig. 199.) Stems stout, mostly 

 rather strictly erect, 4 to 12 inches high; herbage glabrous; leaflets narrowly to 

 broadly oblong, often tapering towards apex, mostly obtuse, strikingly nerved, 

 serrate, %, to 2^2 inches long; stipules lanceolate to ovate, entire; peduncles stout, 

 usually not reflexed at base of head; heads globose, % to l^^ inches wide; flowers 

 6 to 8 lines long, the lower ones reflexed in age ; calyx glabrous, 21/2 to 3 lines long, 



its teeth linear-subulate, straight, equaling 

 the tube, 1^/^ to 1% lines long; corolla red; 

 ovary 2 to 6-ovuled. 



Mountain valleys and meadows, 4000 to 

 6000 feet : northern Sierra Nevada from Ne- 

 vada Co. to Modoc Co. East to Nevada, north 

 to eastern Oregon and southern Idaho. June- 

 July. 



Locs. — Donner Lake, Sonne 348 ; Sardine Valley, 

 Nevada Co., Sonne; Dog Valley grade, Sierra Co., L. 

 S. Smith 1601; Sierra Valley, Lemmon; Big Mdws., 

 Plumaa Co., R. M. Austin 233 ; Egg Lake, sw. Modoc 

 Co., M. S. Baker. 



Eef s. — Trifolium beckwithii Brew. ; Wats. 

 Proc. Am. Acad. 11:128 (1876) ; McDer. N. Am. Sp. 

 Trifolium 276, pi. 117 (1910) ; Jepson, Man. 543 

 (1925). T. altissimum T. & G. Pac. R. Rep. 2:120 

 (1855), type loc. Sierra Nevada; not T. altissimum 

 Loisel. (1807). 



31. T. pratense L. Red Clover. Stems 

 several from the base, i/^ to 2 feet high ; herb- 

 age pubescent; leaflets large, ovate to elliptic, 

 entire or crenulate, often with a whitish blotch 

 near the middle, 1 to 1% inches long; stipules 

 membranous, conspicuously veined; petioles 

 1 to 6 inches long, or the upper often shorter 

 than the leaflets; heads round-ovate to con- 

 ical, % to 1 inch high, subtended by the sessile upper leaves ; calyx-tube pubescent, 

 conspicuously nerved, the teeth subulate; corolla deep pink or red; pod 2-seeded. 

 Naturalized from Europe, low moist valleys, or wet meadows in the mountains : 

 Sierra Nevada, 1400 to 5000 feet, from Mariposa Co. to Siskiyou Co. ; delta region 

 of Great Valley and coastal region, 10 to 500 feet. June-July. 



Locs. — Sierra Nevada: Tosemite Valley, Jepson 8378; Angels Camp, Calaveras Co., Jepson 

 10,426; Murphys, Calaveras Co. (Erythea 6:18) ; Blue Canon, Placer Co., H. A. Walker 1335 

 Mineral, Tehama Co., Jepson 12,273 ; Fort Bidwell, Modoc Co., Jepson 7910. Great Valley 

 Tyler Isl., lower Sacramento River, Jepson 13,692. Siskiyou Co.: Dunsmuir, Jepson 6167 

 Sisson, Jepson 13,691. Coastal region: Los Angeles, E. D. Palmer; Fort Bragg, W. C. Mathews 

 83; Fortuna, Humboldt Co., Jepson; Eureka, Tracy 2987. 



Refs. — Trifolium pratense L. Sp. PI. 768 (1753), typo from Italy; Jepson, Fl. W. Mid. 

 CaL 307 (1901), ed. 2, 227 (1911), Man. 546 (1925); McDer. N. Am. Sp. Trifolium 224, pi. 

 91 (1910). 



Trifolium incarnatum L. Sp. PI. 769 (1753), type from Italy. Crimson Clover. Annual; 

 stems stout, erect or decumbent-ascending, % to 3 feet high; herbage villous; stipules broadly 

 ovate-oblong, conspicuously veined; petioles usually 1 to 3 inches long; leaflets orbicular to 

 obdeltoid, % to IV2 inches long; peduncles stout, 1 to 4 inches long; spikes cylindrical, 1 to 

 21/^ inches long, about ^/^ inch wide; calyx silky-plumose, the tube conspicuously ribbed, about 

 2 lines long; teeth linear-subulate, 4 lines long, becoming rigid and somewhat spreading in 

 fruit ; corolla scarlet to deep red, equaling or exceeding the calyx ; pod one-seeded. — Introduced 

 from Europe and naturalized throughout North America, rare in California: Healdsburg, M. 

 Weidemann. May-July. 



Fig. 199. Trifolium beckwithh Brew, 

 a, habit, X y2 ; ?», fl., X 2. 



