180 PROCEEDINGS OF THE AMERICAN ACADEMY 



1875, The few specimens are imperfect, only a few jjerhaps unde- 

 veloped flowers remaining on the receptacles. 



Trifolium Brandegei. Dwarf, perennial, cespitose and acau- 



tlie tube : small solitary fertile flowers often borne under ground. — Louisiana 

 to Texas. 



25. T. Bejariense, Morieand. Slightly hairy: calyx licrbaceon«, unequally 

 lobed, nearly equalling the corolla ; upper tooth nearly distinct, narrow ; tlie 

 rest broad, acute, reticulated : standard and wings broad, toothed, 3 lines long. 

 — PI. Nouv. 2, t. 2. T. macrocalyx, Hook. Ic. Pi. t. 275. Texas. 



§ 4. Leaflets 3 : heads subtended by a mostly monophyllous usually many-cleft 

 involucre, axillary : flowers in whorls, sessile or nearly so, not reflexed. 



* Low or dwarf perennials, acaulescent or nearly so : flowers rather large : 

 involucre parted, son)ewhat scarious. — Rocky Mountains. 



26. T. Parry I, Gray. Glabrous, often stout : leaflets oblong to oblanceo- 

 late: flowers large, in close heads: bracts 5 to 7, oblong, obtuse : calyx-teeth 

 broadly subulate, equalling the tube. — Am. Jour. Sci. 2. 33. 409. 



27. T. DASYPHYLLL'M, Torr. & Gray. Cespitose, silky : leaflets linear-lan- 

 ceolate, entire: bracts very small, unequal, lanceolate : teeth linear, mucii longer 

 than the tube. 



28. T. Anuinum, Nutt. Cespitose, silky : leaflets cuneate-oblong, entire : 

 involucre of 2 broadly stipuled 3-foliolate leaves : teeth subulate, nearly equal- 

 ling the smaller flowers. — Watson, Bot. King's Rep. 00, t. 8. 



* * Slender annuals : corolla not becoming inflated. — AYestern. 



1- Involucre not membranaceous, deeply lobed : lobes laciniately and sharply 

 toothed. 



29. T. iNVOLUCRATUJt, Willd. Glabrous : leaflets mostly oblanceolate, acute 

 at each end : flowers i inch long, in close heads : teeth thin, long and narrow, 

 entire: ovules several. — T. Wormskioldii, Lelim. T. Jhnhrialum, Lindl. T. 

 spinuloDum, Dougl. From British America to jNIexico. 



Var. HETEKODON. Hcads mostly larger and leaflets broader : some of the 

 teeth setaceously cleft. — T. keterodun, Torr. «&. Gray. Washington Territory to 

 New Mexico. 



30. T. TKiDENTATUM, Lindl. Smooth or glandiilar-puberulent : leaflets 

 linear to narrowly lanceolate : flowers 6 to 8 lines long in close heads : teetii 

 rigid, rather abruptly narrowed from a broad base into the spinulose apex, 

 entire or shortly tootiied : ovules 2. — T. iiiroliicrattim, Torr. & Gray. T. ciricu- 

 lare & /'olj/ii/ii/lliim, Nutt. From Washington Territory to S. California. 



Var. <>HTUsiFLOHL'.M. Stoutcr, often glandular: leaflets usually broader and 

 heads large : teeth entire. — T. olitusijlorum, llook. Central California. 



Var. MELANANTiiiiM. Smootli, often low: flowers smaller, dark-purple: 

 teeth entire or toothed. — T. indananthum, Ilook. & Am. T. varkyatum, fi., 

 Torr. & Gray. S. California to Arizona. 



31. T. PAfciFi,OKUM, Nutt. Smooth, very slender : involucre small: flowers 

 little exceeding the calyx, rather few : teetli rigid, setosely acuminate, entire. — 



