302 LEGUMINOSAE 



20. T. eriocephalum Xutt. AVoolia'-iiead (.'lover. Stems erect or doeunibent 

 at base, Vo to l^i i'eet liijxli; lierba<2:e villous -svitli spreadinj:: hairs, or rarely gla- 

 brous; leaflets narrowly ()l)l()n<2: or sometimes broader, serrulate, 1^2 to 2 inches 

 long; stipules long and narrow (% to IV2 inches long), nearly entire; peduncles 

 11/2 to 6 inches long, becoming recurved; heads dense, globose, slightly spicate, V2 

 to 1 inch broad; flowers early reflexed, 4 to 6 lines long; calyx-teeth filiform, plu- 

 mose, lax, ?3 the length of the petals ; corolla dull yellow ; pods long-hairy towards 

 the apex, 1 or 2-seeded. 



Grassy slopes or valleys, 2500 to 6000 feet: Humboldt Co. to Siskiyou and 

 Shasta Cos. North to "Washington and Idaho, east to Colorado. June-Aug. 



Locs. — Mail Ridge, s. Humboldt Co., Jepson 1894; Van Duzen River valley near Buck Mt., 

 Tracy 2759; Kneeland, Humboldt Co., Chesnut ^ Brew; Mad River near Deer Creek, Blasdale ; 

 Sulphur Camp, se. Trinity Co., Cronemiller 583; Quartz Valley, near Yreka, Butler 379; Goose- 

 nest foothills, e. Siskiyou Co., Butler 918; Burney Valley, ne. Shasta Co., Baker 4r Nutting. 



Var. 'butleri Jepson var. n. Plants reduced, 6 to 10 inches high ; leaflets villous-pubescent 

 beneath, 6 to 12 lines long, the margins minutely denticulate or setate or entire; heads smaller, 

 7 to 9 lines wide; flowers 4 to 5 lines long. — (Plantae reductae, une. 6-10 altae; foliola subtus 

 villoso-pubescentia, marginibus minute denticulatis, setosis vel integris, lin. 6-12 longa; capitula 

 parviora, lin. 7-9 lata; flores lin. 4-5 longi.) — Montane, 5400 to 6500 feet: Siskiyou Co. (Log 

 Lake, Shackelford Creek, Butler 384, type; Marble Mt., Chandler 1712), 



Eefs.— Trifolium eriocephalum Nutt.; T. & G. Fl. 1:313 (1838), type loc. Willamette 

 River, Xuttall; McDer. N. Am. Sp. Trifoliura 237, pis. 96, 97 (1910) ; Jepson, Man. 546, fig. 

 537 (1925). T. scorpioides Blasdale, Erythea 4:187 (1896), type loe. Mad River near crossing 

 of Hy-am-pum trail, Blasdale 4" Howe. T. eriocephalum var. harneyense McDer. I.e. 243, pi. 99 ; 

 Jepson, Man. 547, as to Cal. plants. Var. butleri Jepson. 



21. T. longipes Nutt. Summer Clover. Stems slender, erect or ascending, 

 2 to 12 inches high, arising from a branched woody root-crown ; stems usually gla- 

 brous, the leaflets and calyx sparingly villous; leaflets narrowly lanceolate to 

 oblong, obovate or oblanceolate, serrulate or fimbriate, Y^ to IV2 inches long; stip- 

 ules ovate-lanceolate, entire or toothed; peduncles (1 or) 21/2 to 4% inches long, 

 remaining erect; heads broadly (or roundish) ovate, rather dense, 7 to 10 lines 

 high; calyx-teeth subulate-filiform, straight, more or less hairy, slightly shorter 

 than the corolla; corolla 5 to 6 lines long, yellowish-white or tinged with purple; 

 banner often long-acuminate ; ovules 2 to 4 ; pods oblong to obovate, truncate, vil- 

 lous at apex, 2 to 4-seeded. 



Montane meadow^s and valleys, 6500 to 8500 feet : Sierra Nevada from Tulare 

 Co. to Shasta and Modoc Cos.; North Coast Ranges from Mt. Sanhedrin to the 

 Yollo Bolly Mts. North to Canada, east to the Rocky Mts. June-Aug. 



Locs. — Sierra Nevada: Long Mdw., Golden Trout Creek, Tulare Co., Jepson 4960 (1 to 2^4 

 inches high, representing a high altitude form, 7000 to 8000 feet, with leaflets varying from 

 sub-rotund to linear — sometimes on the same plant — and with short peduncles; other plants 

 from the same altitudes are intermediate towards the usual form) ; Belle Mdw., Tuolumne Co., 

 Jepson 6485 ; Deadman Creek, Sonora Pass, A. L. Grant 294 ; Silver Valley, Alpine Co., Jepson 

 10,146; Summit sta., Nevada Co., Jepson 13,693; Lassen Peak, Chesnut 4" Drew; Twin Lakes, 

 se. Shasta Co., Jepson 4113 ; Martin Sprs., Eagle Lake, Brown 4" Wieslander 59 ; Egg Lake, sw. 

 Modoc Co., M. S. BaTcer; Jess Valley, Warner Mts., L. S. Smith 792 ; Pine Creek, Warner Mts., 

 L. S. Smith 968 ; Goose Valley, n. Modoc Co., M. S. Balcer. North Coast Ranges : Mt. Hull, n. 

 Lake Co.; Soldiers Ridge, se. Trinity Co., Jepson 13,694; Shackelford Creek, w. Siskiyou Co., 

 Butler 1507. 



The varieties named below are incomplete segregations (tha't is they represent merely 

 extremes of variability) and are poorly established geographically. 



Var. elmeri McDer. Stouter, 1^/^ to 2 feet high, with a combination of large leaves and 

 long peduncles; leaflets linear-oblong, l^/^ to 2% inches long; peduncles 5 to 6 inches long. — 

 South Fork Trinity River. This form is no more common than plants (referred to the species) 

 with large leaves in combination with peduncles of the usual length or with long peduncles and 

 leaves of the usual length. 



Var. hansenii Jepson comb. n. Dwarf 2 to 6 inches high ; stems very slender ; leaflets small, 

 variable in shape; heads 3 to 5 lines wide; calyx glabrous. — High montane (8000 feet) in 

 Amador Co. 



