126 



A 

 nor 



LEGUMINOSyE. 



TrifoU 



V "■emis of perhaps 200 or more species, in temperate ami subtropical regions, chielly oi the 

 „u. thorn heniisi.hcre. In North America it is most largely represented on the western suic, only 

 live species being native iu the Atlantic States, while 40 or n.ore are iound in the region west ot 

 the Uocky Mountains, incUuUug a se.aion with invohicrato heads peculiar to the western i.arts ol 

 North uiid South America. Most of the si.ccics of the Coast iJanges and interior valleys are 



•2. T. 

 3. T. 



Andeksonii. 

 Lemmum. 



4. T. KKIOCKl'HALUM. 



PHIMOSUM. 

 LONGU'ES. 



7. T. ALTISSIMUM. 



KiNGII. 



Beckwithii. 



bolanderi. 

 Maciij;i. 



normally " winter animals," the perennials belonging chielly to the Sierra Nevada and cooler ju..- 

 tioiisof the State. I'Vw of thorn are Hullicienlly abundant to yield any important amount ol 

 forage, and none are e.iual iu this respect to the commonly cultivated Euroi.ean species. 



♦ Heads not involucrate : leallets 5 to 7 : Bowers sessile : calyx-teeth fdiform, plumose : perennial. 

 Stout, somewhat villous : flowers spicate, very large. 1. T. megacephai.um. 



Dwarf, den.sely villous : flowers umbellate, half an inch long : leaflets 



nearly entire. ,, i n ^ 



Dwarf, alpine, somewhat iiubescent : flowers spicate, very small : leallets 



coarsely toothed. 



♦ » Heads not involucrate : leaves 3-foliolate. 



Perennial or biennial : heads terminal : flowers sessile or nearly so. 

 More or less pubescent : calyx-teeth very narrow, much longer than 

 the tube, plumose or hairy. 

 Teeth liliform, curved, very plumose : usually pubescent : heads 



ovate. 

 Teeth straicrht, plumose : pubescent : heads ovate to oblong : leal- 

 lets long and narrow. 

 Teeth straight, hairy : stem usually smooth : heads ovate. 

 Glabrous, stout : teeth subulate, twisted, twice longer than the tube : 



heads ovate to oblong. 

 Glabrous : teeth scarcely exceeding the tube. 



Slender : heads rather small : leaflets usually narrow and acuminate, 



coarsely veined and toothed. ^• 



Stouter : heads large : leaflets usually broader and obtuse. 8. 



Low and cesi>itose : heads very small : leaflets small, broad and ob- 

 tuse, linely reticulated and scarcely toothed. 10. 

 Annual, pubescent : lauds mostly terminal : flowers sessile : calyx-teeth 



long-filiform, very plumose. ■,. „, 



Annuals, mostly glabrous : heads axillary : flowers shortly pedicellate : 

 calyx-teeth subulate, not plumose. 

 Glabrous ; calyx-teeth lanceolate, rigid, the scanous margin rough- 



ciliate. , , n ..i 



Glabrous or nearly so : calyx campanulate, the teeth eiiuuUing the 

 petals : heads rather dense. 

 Leaflets not notched. • 



Leaflets deeply notched or 2-clcft. ., ,, , 



Subpubescent throughout : calyx narrow ; teeth shorter than the pet- 

 als : heads very loose. ^^• 

 Glabrous : flowers sessile : calyx short : corolla inflated. -&• 



♦ ♦ ♦ Heads subtended by an involucre : annual. 

 Corolla not becoming inflated : involucre not membranaceous, deeply 

 lobed, the lobes laciniately toothed. 

 Glabrous : heads many-flowered : calyx-teeth thin, long and narrow, 



gradually attenuate, entire or setosely cleft : ovules several. 

 Glabrous or glandular-puberulent : heads many-llowered : calyx-teeth 

 rigid, rather abruptly narrowed from a broad base into the 

 smnulose apex, entire or shortly toothed : ovules 2. 

 Glabrous, very slender : heads small : flowers little exceedin, 



calyx : teeth rigid, setosely acuminate, entire. 

 Often villou.s, small, very slender : flowers 1 to 4, very much longer 

 than the calyx : teeth thin, shortly acuminate. 

 Corolla not inflated : involucre membranaceous, at least at base, less 

 deeply lobed ; lobes entire or serrate. 

 Villous: lobes of involucre entire: calyx-teeth subulate, with broad 



scarious margin. 

 Villous : lobes 3-toothed : calyx-teeth triangular, acute ; margin nar- 

 row, seiTulate. 

 Smooth : involucre very broad ; lobes serrate : calyx-teeth setosely 

 many-branched. 



T. CILIATUM. 



GKACILENTUM. 

 BIFIDUM. 



Bkeweki. 



DEl'AUl'EKATUM. 



16. T. INVOUICUATUM. 



the 



17. 



19. 



TRIDEiNTATUM. 

 I'AUCIiLORUM. 

 MONANTllUM. 



MICROCEPHALUM. 

 MICRODON. 

 CYATUIFERUM. 



