28 LEGUMINOS^. 



of different aspect ; the numerous branches lateral, not basal ; the leaves 

 and heads short-stalked : heads oblong or cylindrical, ^4 in. long, or less : 

 calyx-teeth silky-plumose throughout, longer than the minute whitish 

 corolla. — The Rabbil-fool or Mouse-ear Clover of Europe, naturalized on 

 the Atlantic coast, has been reported from Alameda Co., Kellogg. 



* * Heads subtended by a flat or concave ( sometimes nearly obsolete ) 



involucre. 



■i— Corolla not inflated in age. 



■M- Involucre flat ; heads a little one-sided. 



23. T. WorinskjoWii, Lehm. Ind. Sem. Hort. Hamb. 17 (1825) ; Pugill. 

 i. 36 (1828) ; Spreng. Syst. iii. 209 (1826) : T. helerodon, T. & G. Fl. i. 

 318 (1838), partly. Perennial, spreading underground by slender 

 root-stocks ; stems decumbent, 3 in. — 2 ft. long ; herbage flaccid, 

 glabrous : stipules lanceolate, acuminate, laciniately multifld ; leaflets 

 obovate-oblong, obtuse, pectinate-denticulate, 1 in. long or more : 

 heads hemispherical, 1 in. broad or more ; involucre % — ^4: in- broad, 

 laciniate-aristate : calyx-tube scarious, 10-striate, the alternate nerves 

 less prominent, transverse veinlets ; teeth linear-subulate, much 

 longer than the tube, all entire or 1 or more of them setaceously 2—3 

 parted : banner elliptical, deeply emarginate, pale purple ; other petals 

 darker. — Very common and variable ; on hills about San Francisco only 

 a few inches high ; in springy places, or along perennial streams, coarse 

 and fistulous, forming dense masses, the leaflets often 4 (but the fourtli 

 only half as large as the others), and the calyx-teeth more or less cut into 

 setaceous divisions. The Mexican T. involucratnrn, Willd., to which some 

 authors have referred our plant, has narrow acute leaflets, entire stipules, 

 and a calyx whose tube is less diaphanous, and less prominently nerved, 

 and of which the teeth are much shorter and less aristiform. I have taken 

 up what is clearly the oldest name for this perennial of the Californian 

 seaboard. And I do not think that the T. fimbriatutn., Lindl. (1827) is a 

 synonym of it. In Lindley's species, according to both the figure and 

 description, the bracts forming the involucre are distinct ; and the 

 stipules are much more regularly and deeply cleft than in any Californian 

 plant. It is very probably the northern counterpart of our middle Cali- 

 fornian seaboard species, and it may possibly prove confluent with the 

 next. T. Wormskjoldii when first published was supposed to be a native 

 of Greenland. The author afterwards corrected this error, having learned 

 that the seed had come from California. The handsome figure in the first 

 "Pugillus" represents most accurately the plant of the Presidio hills, 

 San Francisco ; and no doubt it is the same. In cultivation at Berkeley, 

 in dry soil, the species forms a sward, and continues growing and flower-* 

 ing throughout the spring and summer months, just as in its moist native 

 habitat. It is a valuable forage plant. 



