344 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
3. Melilotus alba Desr. in Lam. Encycl. 4: 63. 1797. SWEET CLOVER. 
TyPe LocALity: Siberia. 
New Mexico: Frisco; Farmington; Pecos; Gila Hot Springs; Mesilla Valley; 
Santa Fe; Albuquerque; Las Vegas. 
A common and troublesome weed in many parts of the State, especially in alkaline 
soil. The plant is persistent and spreads rapidly. It is not infrequent in alfalfa 
fields. It is said to be an excellent bee plant, and for this reason has been introduced 
in several places, probably on the recommendation of not overscrupulous seedsmen. 
8. TRIFOLIUM L. CuLover. 
Low perennial herbs, often tufted or diffuse, with palmately 3-foliolate leaves 
(occasionally pinnately 3 to 5-foliolate); flowers usually in pedunculate heads, occa- 
sionally elongated-spiciform; calyx with slender subulate teeth; corolla attached to 
the stamen tube; pods small, membranous, indehiscent, often included in the per- 
sistent calyx. 
KEY TO THE SPECIES. 
Heads involucrate. 
Plants low, cespitose; stems scapiform.................... 1. T. parryi. 
Plants with elongated leafy stems. 
Corolla 12 to 15 mm. long; stems not much elongated, 
mostly erect; peduncles glabrous.............. . 2. T. fendleri. 
Corolla 8 to 11 mm. Jong; stems much elongated, reclin- 
ing; peduncles glabrous or pubescent. 
Peduncles glabrous; involucre united well above 
the base, the divisions broad................ 3. T. lacerum. 
Peduncles pubescent below the involucre; invo- 
lucre cleft almost to the base, the divisions 
very Narrow... ......2..-....2 202. ae eeeeeee 4. T. longicaule. 
Heads not involucrate. 
Stems leafy; plants tall or the stems long. 
Calyx glabrous; flowers white or nearly so. 
Stems creeping, stoloniferous..................- . 6. T. repens. 
Stems erect, tufted.............. 7. T. hybridum. 
Calyx pubescent; flowers ‘mostly purplish. 
Heads sessile........-2...2-2.02 220-00 ceee eee eeeee 8. T. pratense. 
Heads long-peduncled. 
Flowers purplish; stems permanently pubes- 
CONG... 2-2. ee ee eee ee eee eee 9. T. neurophyllum. 
Flowers white; stems glabrous in age......... 12. T. rydbergii. 
Stems scapiform; plants low and cespitose. 
Calyx glabrous; heads | to 3-flowered..............--- 5. 7. nanum. 
Calyx pubescent; heads several to many-flowered. 
Leaflets obovate, strongly veined, sharply dentate..10. 7. subacaulescens. 
Leaflets oblong to lanceolate, entire, not strongly 
veined............-2.0 2222 eee eee eee eee 11. T. stenolobum. 
1. Trifolium parryi A. Gray, Amer. Journ. Sci. II. 33: 409. 1862. 
TYPE LOCALITY: Rocky Mountains of Colorado. 
RanGE: Wyoming and Utah to Colorado and New Mexico. 
New Mexico: Pecos Baldy (Standley). Meadows, in the Arctic-Alpine Zone. 
2. Trifolium fendleri Greene, Pittonia 3: 221. 1897. 
TyPE LocaLity: Near Santa Fe, New Mexico. Type collected by Fendler. 
RanGeE: Colorado to New Mexico and Arizona. 
New Mexico: Santa Fe and Las Vegas mountains; Rio Pueblo; Albuquerque; 
Mogollon Mountains; White and Sacramento mountains. Wet meadows, in the 
Upper Sonoran and Transition zones. 
