PEA FAMILY 303 



Var. nevadense Jepson var. n. Leaflets narrow, the lower lanceolate, acute, the upper 

 linear-acuminate, 2 to 2% inches long; heads 6 to 8 lines high, often longer than broad, and 

 more or less flat-topped; flowers pale; calyx -teeth nearly equaling corolla. — (Foliola angusta, 

 inferiora lanceolata, acuta, superiora linearia, acuminata, unc. 2-2% longa; capitula lin, 6-8 alta, 

 saepe quam lata longiora, ad apicem plus minusve plana; flores pallidi; calycis dentes corollam 

 aequantes.) — Nevada Co. (Truckee, Michener, type; Kneeland, Sonne). Eecognizable by the 

 characteristic upper leaflets and heads, it intergrades freely with the species in the same district. 



A^'ar. atrorubens Jepson comb. n. Stems slender, erect or often decumbent at base; heads 

 ovate, 8 to 9 lines wide; calyx-teeth densely white-villous ; corollas dark purple with lighter 

 keel. — Wet meadows, 6500 to 8200 feet: San Bernardino Mts. (Bluff Lake, Munz 10,490; Bear 

 Valley, Parish 3113) ; San Jacinto Mts. (Tahquitz Valley, Hall 2365). 



Var. shastense Jepson comb. n. Leaflets lanceolate to linear-lanceolate, 1% to 2 inches 

 long, commonly 1 to 2 lines wide; peduncles slender, lax, 2^/^ to 8 inches long; banner and wings 

 usually long-acuminate. — Siskiyou and Del Norte Cos.: Ash Creek, Mt. Shasta, M. S. BaTcer ; 

 Mt. Eddy, Lemmon; North Fork Smith Eiver, Doris Eildale. 



Eefs. — Trifolium longipes Nutt.; T. & G. Fl. 1:314 (1838), type loc. Eocky Mts., Nuttall; 

 McDer. N. Am. Sp. Trifolium 246, pis. 100, 101 (1910) ; Jepson, Man. 547 (1925). Var, elmeri 

 McDer. I.e. 253, pis. 104, 105; Jepson, Man. i.e. T. elmeri Greene, Pitt, 3:223 (1897), type loc. 

 South Fork Trinity Eiver, Chesnut 4" Drew. T. plumosum Drew, Bull, Torr. Club 16:149 (1889), 

 type loc. South Fork Trinity Eiver, Chesnut 4" Drew (not T. plumosum Dougl, 1830). Var. 

 HANSENii Jepson. T. hansenii Greene, Erythea 3:17 (1895), type loc. Silver Lake, Amador Co., 

 Hansen 745. T. longipes t. hansenii McDer. I.e. 250, Var. nevadense Jepson, Var. atrorubens 

 Jepson. T. rusbyi var. atrorubens Greene, Erythea 4:66 (1896), type loc. Bluff Lake, Parish 

 3745. T.rMsfci/i Greene, Pitt. 1:5 (1887), in part, T. otrorybens House, Bot, Gaz. 41:336 (1906), 

 T. longipes var, elmeri f. atrorubens McDer, I.e. 256, Var, shastense Jepson, T. shastense 

 House, Bot. Gaz. 41 :336 (1906), type loc. Mt, Shasta, H. E. Brown 362. 



22. T. macrocephalum Poir. Big-head Clover. Stem stout, simple, 4 to 9 

 inches high ; herbage somewhat villous ; leaflets 4 to 9, cuneate-oblong to obovate, 

 obtuse, serrulate, mucronate, 3 to 8 lines long ; stipules large, ovate-oblong, sparsely 

 serrate ; heads mostly terminal, globose-ovate, li/4 to 1% inches wide ; calyx 6 to 8 

 lines long, the teeth filiform, plumose, 3 to 4 times as long as the tube ; corolla % 

 to IVs inches long, purplish; ovary 6-ovuled; pods stipitate, usually 1-seeded. 



Mountain valleys and plateaus, 2000 to 5000 feet : Sierra Co. to Modoc, Shasta 

 and Siskiyou Cos. East to Nevada, north to British Columbia. Rather rare, 

 Apr.-June. 



Locs. — Sierra Valley, Lemmon; Jess Valley, Warner Mts., L. S. Smith 795; Edgewood, 

 Siskiyou Co., J. W. Kisling ; Yreka, Btctler 639. 



Eefs. — Trifolium macrocephalum Poir.; Lam. Encycl. Suppl. 5:336 (1817); McDer, N. 

 Am. Sp. Trifolium 196, pis. 79, 80 (1910) ; Jepson, Man. 544, fig. 534 (1925), Lupinaster ma- 

 crocephalus Pursh, Fl, 479, t, 23 (1814), type loc, headwaters of the Missouri Eiver, Lewis. T. 

 megacephalum Nutt, Gen, 2:105 (1818), based on last, 



23. T. monoense Greene. Mono Clover. Caespitose dwarf 2 to 3 inches high, 

 the leaves and peduncles matted on the branching root-crown ; herbage whitish- 

 pubescent; leaflets narrow-oblanceolate, abruptly acute or acuminate, entire, 3 to 

 5 lines long; stipules membranous, conspicuously crowded on the ends of the root- 

 crown branches; peduncles 1% to 2% inches long, conspicuously exceeding the 

 leaves, rarely shorter; heads 8 to 9 lines broad, a little broader than high; calyx- 

 tube 11/2 to 2 lines long, the filiform teeth densely hairy, 2 to 3^4 lines long; corolla 

 pink, barely exceeding the calyx; pods densely tomentose at apex, 1 or 2-seeded. 



Gravelly sandy soil of alpine slopes or flats, 10,300 to 12,000 feet : White Mts., 

 Mono Co, July. 



Tax. note. — The genetic relation between Trifolium monoense and T. andersonii is so very 

 close as to call in question the status of the former as a species. McDer mo tt (N. Am. Sp, Tri- 

 folium, 185) treats it as forma monoense of T, andersonii. The shape of the leaflets of T. mono- 

 ense is, however, distinctive and consistently different from the shape in T. andersonii ; the leaflets 

 are smaller, less densely pubescent above and have shorter petioles. The heads of T. monoense 

 are smaller, the pedimcles are longer (commonly conspicuously exceeding the foliage) and the 

 flowers are slightly smaller than in the case of T, andersonii. The petals exceed the calyx by a 

 less amount in T. monoense and the pubescence is shorter, Trifolium monoense is, further, a 

 species of higher altitudes. It forms very close mats on the ground in the sagebrush association. 



