48 IG. LEGUMINOS^. 



4. Tbifolium, L. 



(Latin prefix fj'i, three, and fdliiun, a leaf.) 



Petals narrow, persistant after withering, usually 

 united t()ij;ether and attached to the staminal tube by their 

 claws : pod very small, enclosed in tlie persistant calyx or 

 corolla, usually indehiscent, Avith few seeds; flowers small, 

 in heads; leaves of 3 leaflets; stipules united to the petiole 

 by their base. 



Flowers yellow; pod 1-sceded, on a short 

 carpophoro. 

 Flowers 30-50 in dense ovoid heads; stand- 

 ard furrowed 7'. iirocv tiihois 1 



Flowers fewer, in loose globular heads; 

 standard scarcely furrowed. 

 Flowers 5-15 in head ; pedicels shorter 



than calyx-tube T. (hihium 2 



Flowers 2-8 in head ; pedicels longer 



than calyx-tubo 7'. fi/l forme 3 



Flowers pink or white. 



Calyx inflated after flowering; pod 1- 

 seeded, sessile. 



Creeping pereiniial T. frafiifcrum 4 



Small annual T. tometitosum 5 



Calyx not inflated. 



Calyx and whfile plant glabrous; pod 

 2-4-seeded. 



Perennial ; heads pedunculate T. reqietis 6 



Animal; heads sessile 7'. (//onirrafinu 7 



Calyx hairy or ciliate on teeth; pod 

 1-seeded. 

 Flowers few in head; fruiting peduncles 



recurved 7'. stihlt rrdtionn 8 



Flowers numerous in head ; peduncles 

 not recurved. 

 Perennial ; heads very large. 

 Calyx-tube subglabrous, throat vil- 

 lous T. mrtlhim 9 



Calyx-tube villous, throat glabrous T. prntrnse 10 

 Annuals. 



Heads sessile; calyx hairy, with 



suberect teeth T. sfrintiiiu 11 



Heads pedunculate. 



Corolla shorter than the plumose 



calyx-teeth T. urrfiisc 12 



Corolla equalling of exceeding 

 calyx. 



Leaflets oboyal T. inrartKitnm 13 



Leaflets linear 7'. aiujustifoHvm 14 



1. TrifoliuiYi procumbens, I^. Hop (lover. 

 Glabrous or downy annual, witli a simple erect stem, or 

 with brandies ascending from near the base; leaflets oboval, 

 wedgesliaped at l)ase, denticulate, the mid<lle one on a 

 much longer pctiolule than the lateral ones; stipules ob- 



