306 DIADELPHIA— DECANDRIA. Trifolium. 



point. Spikes numerous, terminal, stalked, solitary, erect, an 

 inch, more or less, in length, cylindrical, dense, obtuse, hoary, 

 with a purple tinge. Cal. very hairy, especially its bristle-shaped 

 teeth, which are twice the length of the tube, much exceeding 

 the corolla, equal ; reddish in the flower ; spreading as the seed 

 ripens, but though somewhat hardened, always continuing slen- 

 der. Pet. white, or pale pink, their claws scarcely combined ; 

 standard broad, ovate. Legume minute, membranous, with a 

 single seed. 

 Sometimes very dwarfish, and densely silky, on barren sands near 

 the sea, when the root becomes elongated in search of nourish- 

 ment, but never, I believe, perennial. See variety /3. 



12. T.scabrum. Rough Rigid Trefoil. 

 Heads sessile, axillary, ovate. Calyx-teeth unequal, lan- 

 ceolate, rigid ; finally recurved. Stems procumbent. 



T. scabrum. Linn. Sp. PL 1084. Willd. v.3. 1374. Fl. Br. 788. 



Engl. Bat V. 13. t. 903. Curt. Lond.fasc. 6. t. 48. Hook. Scot. 



219. 

 T. n. 371. Hall. Hist. V. I. 16\. 

 T. flosculis albis, in glomerulis oblongis asperis, cauliculis proxim^ 



adnatis. Rail Syn. 329. Vaill. Par. 196. t. 33./. 1. 

 T. minus, capite subrotundo parvo albo et echinato. Barrel. Ic. 



i. 870. 

 T. cujus caules ex geniculis glomerulos oblongos proferunt, Bauh. 



Hist. V. 2. 373. f. 



In chalky, or dry sandy, fields. 



On Newmarket heath. Ray. Between Northfleet and Gravesend. 

 Dill. About Croydon. Curt. Near Bungay. Mr. Woodward. 

 On Snettisham beach, and in an old chalk-pit near Wells, Nor- 

 folk. Mr. Crowe. At Wick clifls; Mr. Swayne. With. On 

 Cromer cliffs, Norfolk. 



Annual. May, June. 



Root tapering. Whole herb very rigid, and harsh to the touch, 

 especially when in seed. Ster)is several, from 3 to 9 inches long, 

 procumbent, rigid, round, sometimes zigzag, leafy, hairy, scarcely 

 branched except from the bottom. Leaflets obovate, or some- 

 what heart-shaped, with many prominent transverse ribs, hairy, 

 minutely but sharply toothed, longer or shorter than their com- 

 mon footstalk. Stipulas membranous, ribbed, ovate, pointed. 

 Heads numerous, axillary and terminal, solitary, sessile, ovate, 

 dense, hairy. Cal. furrowed ; its teeth green, lanceolate, spi- 

 nous, a little unequal, always spreading, but when ripening seed 

 strongly recurved, which gives the harshness iibove described. 

 Legume membranous, whitish, enclosed in the calyx-tube. Seed 

 solitary, yellowish. A useless weed. 



