TETRADYNAMIA-SILICULOSA. Teesdalia. 169 



J. Sherard. On St. \'incent's rocks, Bristol. Hiids., and Dr. 

 John Ford, where it still grows. Also at Uphill, Somersetshire. 

 Hiids. On a limestone wall 2 miles from Pembroke. Mr. Adams. 

 In various other parts of Wales, and of the mountainous lime- 

 stone district of Yorkshire. Dr. Hooker. 



Annual. March, April. 



Root fibrous, annual rather than biennial. Stems one or more, 2 

 or 3 inches high, erect, leafy, branched, spreading, smooth, or 

 finely downy. Leaves elegantly pinnate, of numerous pairs of 

 elliptic-oblong, entire, smooth leaflets, with a terminal one of 

 the .same size, their common stalk channelled and bordered, so 

 that the whole may be denominated a deeply pinnatifid leaf. Fl. 

 white, very minute, corymbose. Pet. narrow. Pouches in longish 

 clusters, spreading, oval, compressed, at first entire, tipped with 

 the sessile stigma, but as they advance to maturity the point of 

 each valve becomes slightly elongated or dilated, making a small 

 notch to contain the somewhat elevated stigma. Seeds 2 in 

 each cell, one above the other. 



I beg leave to repeat that this plant has the pouch of a Lepidium, 

 according to the original idea of that genus, being "emarginate 

 and many-seeded "; but the cotyledons being accumbent, not 

 incumbent, oblige us to take advantage of the seeds not being 

 solitary, as in Lepidium better defined, to separate it, along 

 with others whose seeds are still more numerous, as a distinct, 

 though not very natural, genus. See Hooker and DeCandoUe. 



The name commemorates the late Miss Hutchins, a very distin- 

 guished botanist, whose discoveries in the neighbourhood of 

 Belfast have often been celebrated, and ivhose premature death 

 is deplored by all who knew her. 



323. TEESDALIA. Teesdalia. 



Br. in Ait. H. Kew. v. 4. 83. Comp. ed. 4. 108. Tr. of Linn. Soc. 

 V. 11.283. DeCand. Sjjst. v. 2. 391. 



Cal. equal at the base, with spreading, ovate, concave, 

 nearly equal, deciduous leaves. Pei. obovate, undivided, 

 spreading, either equal, or unequal, the 2 outermost in 

 the latter case much the largest. Filam. cylindrical, 

 sometimes but 4, shorter than the corolla, incurved, each 

 bearing an ovate, petal-like scale, at the inner side, just 

 above the base. Anth. of 2 round, distinct, converging 

 lobes. Germ, roundish, 2-lobed, rather compressed. 

 Stigma globular, sessile. Pouch transversely compressed, 

 roundish, concave on one side ; bordered at the summit 

 and cloven ; of 2 cells, and 2 boat-like valves, with dilated 

 keels; partition lanceolate, narrow, contrary to the 

 greater diameter of the pouch. Seeds 2 in each cell, 



