292 LEGUMINOSAE 



spni. of Tidestrom, in the other the calyx-teeth are not toothed, or rarely so in an obscure manner. 

 All such calyx states pass into one another; any two of them may not infrequently be found on 

 one individual ; and in no case arc they definitely and constantly associated with distinctive 

 features in other organs, nor have they any apparent geographic segregation. In no case are 

 the calyx-teeth tridcntate in the sense of having three equal or subequal teeth. Plants with 

 similar calyces or involucres may be either robust or slender, with small or large heads, with 

 oblong or linear leaflets, or may combine other variations common within the species. Well-known 

 to the folk on account of its rank growth, it is called by various names, one being Bull Clover, 

 another Sour Clover, still another Strawberry Clover. 



Locs. — Coastal S. Cal.: Cuyamaca Lake, Pcirson 5971; Mesa Grande, Ferguson 36; San 

 Diego, Jepson 6662; La Jolla, Jepson 11,873; Banning, Gilman; San Bernardino, Parish; Eaton 

 Canon, San Gabriel Mts., Feirson 423; Santa Catalina Isl. (Erythea 7:144) ; Pelican Bay, Santa 

 Cruz Isl., Jepson 12,121. Coast Ranges: Cuesta Pass, Santa Lucia Mts., Jepson 11,961; Mt. 

 Hamilton, Jepson 4201, 8236 ; Corral Hollow, se. Alameda Co., Jepson 9581 ; Niles Canon, Jepson 

 2474; Mt. Diablo, Jepson 10,691; Berkeley, Greene; Weldon Canon, Vaca Mts., Jepson 13,677; 

 Sonoma Valley, Jepson 4191; Yountville, Jepson 13,674; St. Helena, Jepson 13,672; Calistoga, 

 Jepson 9183 ; Geyser Canon, n. Sonoma Co., M. S. Baker 645 ; Ukiah, Jepson 9282 ; Mail Ridge, 

 Humboldt Co., Jepson 1904; Willits, Mendocino Co., Jepson 2481; Longvale, Mendocino Co., 

 Jepson 12,382. Great Valley: Rosedale, Kern Co., Davy; Patterson, Stanislaus Co., Jepson 

 11,568 ; VacaviUe, Jepson 13,679 ; Mills sta., n. Sacramento Co., Jepson 15,729 ; Marysville Buttes, 

 Jepson 13,678; Coming, BlanMnsMp ; Red Bluff, Jepson 13,675. 



Var. watsonii Jepson comb. n. Leaflets often narrowly linear (commonly 1 to 1% inches 

 long, % to 1% lines wide); involucre much reduced, the divisions triangular; calyx-tube con- 

 spicuously elongated, the lobes very short, simple or toothed ; herbage often purple-tinged ; 

 stipules and calyx deep purple. — Fields and hill slopes, 125 to 5300 feet: Sierra Nevada foothills 

 from Fresno Co. to Butte Co. 



Locs. — Dunlap, Fresno Co., Jepson 2757; Bootjack, Mariposa Co., Jepson 12,785; Columbia, 

 Tuolumne Co., A. L. Grant 697; Parrotts Ferry, Stanislaus River, A. L. Grant 72a; Gwin Mine, 

 Calaveras Co., Jepson 1778, 1787; Willow Sprs. sta., Amador Co., Jepson 15,250; Salmon Falls, 

 Eldorado Co., Jepson 15,756; Auburn, Shoclcley; Yankee Jim, Placer Co., L. S. Smith 1613; 

 Big Chico Creek, Butte Co., Heller 10,712. 



Var. clivorum Jepson var. n. Plants very robust; stems rigid, simple or branched, 1% to 

 3 lines in diameter, 2 to 2^^ feet high; leaflets linear, 1 to 2^/4 inches long; heads large, broadly 

 conical, 1 to 1^ inches high, the corollas conspicuous, exceeding the calyx by about 6 lines; calyx 

 teeth long-acicular, simple or tridentate, the lateral teeth short. — (Plantae robustissimae ; capi- 

 tula magna, late conoidea, unc. 1-1% alta; corollae manifestae, de lin. 6 calycem superantes; 

 calycis dentes simplices vel tridentati, dente medio aciculare, dentibus lateralibus brevibus.) — 

 Valleys in the foothills of Mariposa Co., 1300 to 1500 feet: Cathay Valley, Jepson 12,763 (type) ; 

 Ruth Pierce Mine above Hornitos, Jepson 10,714. 



Var. polyodon Jepson comb. n. Stems flaccid, 1 to 1% feet high; stipules laciniate, the 

 margins or tips reflexed; leaflets obovate, serrulate, 3 to 11 lines long; involucre not deeply lobed, 

 each lobe many-toothed; heads 4 to 7 lines broad; calyx turbinate, 10-nerved, reticulate, the 

 teeth tridentate or multifid ; corolla dull purple, fading to white at the top ; pods 2-seeded, — 

 Moist hiUslopes, 20 to 300 feet: Pacific Grove, Heller 6707. In its habit and size of its heads 

 this form is more nearly like T. variegatum Nutt. than T. tridentatum Nutt. The reflexed 

 stipules are also reminiscent of certain forms of T. variegatum in the South Coast Ranges. 



Refs. — Trifolium tridentatum Lindl. Bot. Reg. sub t. 1070 (1827), type loc. Columbia 

 River, Douglas; Jepson, Fl. W. Mid. Cal. 309 (1901), ed. 2, 224 (1911), Man. 538, fig. 526 

 (1925) ; McDer. N. Am. Sp. Trifolium 19, pis. 3, 4, 5 in part (1910). T. trimorphum Greene, 

 Pitt. 3:220 (1897), type loc. Alameda and Contra Costa Cos. (leaflets trimorphic; flowers whitish 

 or flesh color). T. tridentatum f. trimorphum McDer. I.e. 20, pi. 6; Jepson, Fl. W. Mid. Cal. 

 ed. 2, 224 (1911). T. tridentatum var. melananthum Wats. Proc. Am. Acad. 11:130 (1876) 

 (flowers smaller, ex char.). T. segetum Greene, Pitt. 3:221 (1897), type loc. "Middle Cali- 

 fornia". T. tridentatum var. segetum McDer. I.e. 24; Jepson, Fl. W. Mid. Cal. ed. 2, 224 (1911), 

 Man. 538 (1925). T. aciculare Nutt.; T. & G. Fl. 1:319 (1838), type loc. Santa Barbara, Nuttall. 

 I. tridentatum var. aciculare McDer. I.e. 26, pi. 7; Jepson, Fl. W. Mid. Cal. ed. 2, 224 (1911), 

 Man. 538 (1925). T. polyphyllum Nutt. I.e., type loc. Santa Barbara, Nuttall (leaflets 3 to 5). 

 T. scabrellum Greene, Pitt. 1:159 (1888), type loc. Visalia, Patterson (slightly scabrous). Var. 

 WATSONII Jepson. T. watsonii Loja. Nuov. Giorn. Bot. Ital. 15:186 (1883), type loc. Chico, 

 Butte Co., Anna Bidwell. T. tridentatum var. aciculare f. watsonii McDer. I.e. 28; Jepson, Fl. 

 W. Mid. Cal. ed. 2, 224 (1911). Var. clivorum Jepson. Var. polyodon Jepson. T. polyodon 

 Greene, Pitt. 3:215 (1897), type loc. Pacific Grove, Greene; McDer. N. Am. Sp. Trifolium 93, 

 pi. 34 (1910) ; Jepson, Fl. W. Mid. Cal. ed. 2, 225 (1911), Man. 538 (1925). 



5. T. obtusiflorum Hook. Creek Clover. (Fig. 193.) Stems stout, erect or 

 decumbent-ascending, fistulous, 12 to 17 inches high; herbage clammy-hispidulous 



