Trigonella.] XXV. PAPILIONACE#, 109 
Europe, extending northward to Denmark. In several maritime counties 
of England, Ireland, and southern Scotland. J. carly summer, 
VIII. TRIFOLIUM. CLOVER. 
Herbs, with stipules adhering to the leafstalks. Leaves pinnately or 
almost digitately trifoliolate ; the leaflets often toothed. J lowers red, 
white or yellow, in close heads. Calyx 5-toothed. Petals narrow, often 
connected together, and attached to the staminal tube by the claws, and 
usually remaining round the pod after fading. Stamens diadelphous, 
the upper one entirely free. Pod enclosed in the. calyx, or in the per- 
sistent petals, containing from 1 to 4 seeds, and usually indehiscent. 
A very widely spread and numerous genus in the northern hemisphere, 
both in the New and the Old World, deficient in several tropical regions, 
but reappearing in southern America and Africa. It is readily dis- 
tinguished from Medicago and Trigonella by the pod, from Melilotus by 
the compact heads of flower, and most of the species differ from all 
allied genera by the petals, either all or the three lower ones only, 
connected by their claws with the staminal tube. 
Heads of flowers pedunculate in the axils of the leaves, or above the last 
leaves of the stem 
flex: of flowers closely sessile in the axils, or within the last leaves of the ‘ 
stem . ‘ : 5 ; : ‘ > 1S 
Flowers yellow, reflexed and brown when faded . : ‘ : : : os 
Flowers red, white, or cream-coloured ‘ ; : : : 3 
sf Flowers 30 to 40, in a compact head. Standard distinctly furrowed when 
BA faded . 5 . 19. T. procumbens. 
( Flowers not more than 20 in the head. " Standard scarcely striate 
Flowers usually 10 to 20 in the head, sessile or on very short pedicels. 
4 Central leaflet usually raised above the others. é 3 20. T’. minus. 
re 2 or 3, rarely 5 or 6 in the head. TPedicels as long as the calyx- 
tube. Central leaflet usually sessile between the others . 21. T. jfiliforme. 
5 co pedicellate in the head, reflexed after fading : ‘ 3 Sys 
Flowers sessile, erect . : ; ; : 3 i ae 
Stem creeping and rooting at the nodes 17. T. repens. 
64 Stem ascending or erect and branched, without roots at the nodes. 
TS.ce- ee idum. 
” Stem creeping and rooting at the BONS, or closely prostrate é 8 
Stem ascending or erect ; ays 
Heads globular. Flowers small. Ge much inflated after floweri ing. 
TGaree fragiferum. 
Heads of few rather large flowers. Peduncles turned down into the ground 
after flowering . : : . 15. 7. subterraneum. 
9 : Heads oblong or cylindrical when fully out . : ‘ : : 
Heads ovoid or globular 3 ; : : i ae 
10 § Corolla-small, shorter than the long, fine calyx- teeth | : T. arvense. 
( Corolla showy. Standard longer than the a teeth : 1. 7. ‘Silehebentuibe 
11 Corolla small, 1 to 3 lines long : ‘ : : : q 12 
Corolla showy, 5 to 6 lines long or more ‘ ; . ‘ 13 
Calyx-teeth short, lanceolate, slightly ciliate ‘ ‘ ‘ _T. maritimum. 
Calyx-teeth short, subulate, glabrous : . Li. LT. strietum. 
124 Calyx softly hairy, the teeth longer than the corolla. spreading after flower- 
ing. . 23. T. stellatum. 
Calyx inflated after flowering. Standard turned outwards 14. 7. resupinatum. 
13 { Annual. Teeth of the calyx | nearly equal . LL. TZ. tnearnatum. 
Perennials. Lower tooth of the coral longer than the others 1 
14jFlowersred_. . : - : : 6. T. medium. 
| Flowers cream- coloured . ‘ ‘ : ' ‘ ‘ 4. T. ochroleucum. 
1b { Corolla showy, 6 lines long or more : ‘ . ; ; : ‘ . 16 
Corolla small, 1 to 3 lines : : : : : : : 5 : tai 
