1895.] NATURAL. SCIENCES OF PHIIiAOELHHIA. 553 



T. gracile Hook., lc. t. 43; Torr. and Gray, PL, 1,94; Greene, Fl. Fr., 278, and 

 Man., 27. 



Pod 1 to H inches long, lance-linear to linear, strongly decom- 

 pressed throughout, the cross-section nearly or quite linear; par- 

 tition extremely narrow, but apparently never wanting; seeds in 

 one row, filling each narrow keel- like valve, in outline somewhat 

 quadratelv oblong, black. 



T. macrocarpum Hook, and Harv. in Herb. Kew. "? T. dubium" Kobinson, 

 in Gray, Syn. Fl., I, 141, ex descr., but not as to Davidson's type. T. gra- 

 dle, var. scabriusculum, Greene, Fl. Fr., 278, and Man., 27, partly, but not 

 T. scabriusculum Hook. 



Pod H to 3 inches long, narrowly linear (often little more than 



A line wide), very flatly obcompressed throughout, or occasionally 



the lower ! or \ as flatly compressed laterally, this part destitute 



of partition, but the upper division obviously partitioned: ripe seeds 



unknown. 



T. dubium Davidson, Eryth., II. 180. 



Pod '« to 1] inches long, lance-linear, 1 line wide, the cross-sec- 

 tion distinctly and rather sharply rhombic, either 1 -celled through- 

 out, or the upper * or \ obcompressed and partitioned : seeds half 

 as large as in T. gradle, dark brown, obovoid. 



T. oapparideum Greene, Pitt., 1,217; Fl. Fr., 278 ; Man., 27; probably " ?T. cap- 

 parideum" Robinson, 1. c. 



Pod oblong, or linear-oblong, about \ inch long, slightly obcom- 

 pressed, the cross-section elliptic-oblong, partition wholly wanting ; 

 valves 4, but two narrower than the others and more persistent : 

 seeds in 4 rows. 



The first of the above species is the most variable one, being 

 usually erect and simple, with little pubescence, the pods without 

 any. In a more freely branching state, with abundant rather 

 harsh pubescence, it is T. scabriusculum Hook., though not what 

 I formerly so considered ; and I find the transition from typical 

 T. gradle to this so numerous, and the distinction so slight, that I 

 should hardly concede to the latter even varietal rank. 



The second species, T. macrocarpum, hitherto unpublished, is 

 what I had mistaken for T. scabriusculum ; and it was at Kew that 

 I discovered my error, where I found this very distinct species 

 indicated as a new one, in the handwriting of Harvey, with the 

 above name assigned it. Dr. Davidson, of Los Angeles, included it 



