54 UNITED STATES AND MEXICAN BOUNDARY. 
MELILOTUS PARVIFLORA, Desf.; Torr. Ё Gray, 1. c. M. occidentalis, Nutt. l. c. Western 
Texas, Chihuahua, Sonora and California, April—May. Introduced from Europe. 
TRIFOLIUM FIMBRIATUM, Lindl. Bot. Reg. t. 1070; Torr. & Gray, Fl. 1, p. 317. Near San 
Diego, California, Мау; Parry. Napa and San Isabel in the same State; Thurber. АП our 
specimens of this plant are clothed with a minute glandular pubescence. The leaflets are 
lanceolate or oblong-lanceolate, and conspicuously fringed with narrow spinulose serratures. 
Teeth of the calyx always entire, and broadly lanceolate at the base. Legumes 2-seeded. The 
Indians of California collect the seeds for food. 
TRIFOLIUM HETERODON, Ó. Torr. & Gray, РІ. 1, р. 318. Monterey, California, Мау; Parry. 
Differs from the preceding in being glabrous, with oblong or obovate leaflets; the stipules much 
less cut; the calyx-teeth subulate from a narrow base; the two upper ones 2—3-cleft, and in 
the legumes 4—5-seeded. e 
TRIFOLIUM SPINULOSUM, 8. Torr. Ф Gray, 1. c. Near Monterey, California, May; Parry. 
Near the last, but distinguished by the entire teeth of the calyx, more laciniate stipules and 2-. 
seeded legumes. From T. fimbriatum it differs in a glabrous, and in the much longer and 
` narrower calyx-teeth. 
. TRIFOLIUM Macrai, Hook. Ф Arn. Bot. Mise. З, p. 119. Т. albo-purpureum, Torr. & Gray, Fl. 
1,5 319. Santa Barbara, California, April; Parry. 
TRIFOLIUM TRIDENTATUM, Lindl. Bot. Heg. sub t. 1070. Т. involucratum; Torr. & Gray, 1. c. 
non Willd. Santa Barbara, California ; Parry. 
TRIFOLIUM INVOLUCRATUM, Willd. Sp. 3, р. 1372; Gray, Pl. Wright. 2, р. 41. Hills at the 
Copper Mines and along the Mimbres, New Mexico, June; Bigelow. Mabibi, Sonora; Thurber. 
TRIFOLIUM BEJARIENSE, Moricand, Pl. Nouv. Amer. p. 2, t. 2. Western Texas, April; Wright. 
TRIFOLIUM FucatuM, Lindl. Bot. Reg. t. 1883; Torr. & Gray, l. с. Т. physopetalum, Fisch. 
& Mey. Ind. Sem. St. Petersb. 1837, p. 18. Santa Barbara, and on the beach San Juan 
Capristano, California, March—May ; Parry. San Isabel; Thurber. As tout species, easily 
distinguished by its very large head, and broadly lanceolate entire segments of the involucre. 
TRIFOLIUM AMPLECTENS, Torr. & Gray, 1. c. 1, p. 319 ; Hook. & Arn. Bot. Beech. p. 330, t. 18. 
San Fernando and San Luis Obispo, California; Parry. 
TRIFOLIUM VARIEGATUM, Nutt. in Torr. & даж Fl. 1, р. 317, Sonora, June; Thurber. 
| TRIFOLIUM MICROCEPHALUM, Pursh, Fl. 2, p. 478; Torr. Ё Отау, 1: с. San Diego, California, 
May; Thurber. 
НовлсктА OBLONGIFOLIA, Benth. РІ. Hartw. p. 305. Mountains east of San Diego, California, 
June; Parry. Resembles H. bicolor, but differs in being pubescent, and in the narrowly 
oblong acute leaflets, as well as in other characters. The legume is straight, about an inch 
and a quarter long, and scarcely two lines wide. I have never seen H. bicolor with bracts, but 
in this species бин: is always a unifoliate bract to each head of flowers. 
Hosackta GRACILIS, Benth. in Linn. Trans. 11, p. 365; Torr. & Gray, Fl. 1, p.923. (Тав. 
XV.) Monterey, California, May. A rare species which we have received only from the 
vicinity of Monterey. It has much the appearance of a depauperate state of H. bicolor. The 
petiolate trifoliate bract is always present. 
HosackIA srRIGOSA, Nutt. in Torr. & Gray, l.c. Н. rubella, Nutt. l.c. Near Santa Barbara, 
California, March ; Parry. Annual. Stem branching from the base; the branches 3—4 
