158 TETRADYNAMIA— SILICULOSA. Draba. 



Seeds many in each cell, small, roundish, without a border; 

 cotyledons accumbent. 

 A numerous herbaceous genus ; its pubescence forked or 

 starry. Leaves undivided. Fl. white or yellow, without 

 bracteas. DeCandolle has 59 species, (I think them too 

 many,) besides 6 of his Erophila, separated from Draba 

 merely because of the cloven ]petals, an ambiguous cha- 

 racter, some acknowledged Draba having those parts oc- 

 casionally notched or entire. 



1. T>. verna. Common Whitlow-grass. 



Stalks radical, naked. Petals deeply cloven. Leaves lan- 

 ceolate, somewhat notched, hairy. 



D. verna. Linn. Sp. PL 896. Willd. v. 3. 426, Fl. Br. 677. Engl 

 Bot. V. 9. t. 586. Curt. Lond.fasc. l.t.49. Hook. Scot. 1 96. 

 FLDan.t.983. 



D. n. 496. Hall. Hist. V. 1.215. 



Erophila vulgaris. DeCand. Syst. v. 2. 356. 



Paronvchia vulgaris. Rail Syn. 292. Ger. Em. 624./. Dod. Pempt. 

 112./. 



P. alsinefolia. Lob. Ic. 469. f. Dalech.Hist. 1214./. 



Whitlow Cress. Petiv. H. Brit. t. 48./. 6. 



/3. Notched Whitlow Cress. /. 7. 



On walls, banks, and dry waste ground, abundantly. 



Annual. March, April. 



Boot fibrous, of considerable length. Stem none. Leaves several, 

 forming a star close to the ground, oblong-lanceolate, entire, or 

 in /3 notched, clothed with simple as well as forked hairs. Flower- 

 stalks one or more, radical, round, wavy, smooth, leafless, each 

 bearing a corymbose cluster of several inodorous -whitejlowers. 

 Pet. cloven half way down. Pouch smooth, veiny. 



2. D. aizoides. Yellow Alpine Whitlow-grass. 

 Stalks solitary, naked. Petals slightly notched, twice the 



length of the calyx. Leaves lanceolate, rigid, keeled, 

 fringed. 



D. aizoides. Linn.Mant. 9\. Willd. v. 3.424. Fl. Br. 1400. Comp. 

 ed.4.l09. Engl. Bot. v.\8.t.\27l. Jacq.Austr. t.\92. De- 

 Cand. Syst. V. 2. 333. Don H. Brit.fasc. 8. 1 86 ; cultiv. speci- 

 mens. 



D. n. 498. HalLHist.v.\.2\5. 



Sedum petrseum. Ger. Em. 5 1 4./ 



S. petrseum montanum. Lob. Jc. 381./ 



S. alpinum sextum. Clus. Pann. 49 \.f. Hist. v. 2. 62./. 



Bursa pastoris alpina rosea lutea, kc. Moris, v. 2. 306. sect. 3. t. 20. 

 /9. 



