1890.] BOTANICAL GAZETTE. I5 



[From the Botanical Gazette, Vol. xv, No. 1.] 



A new genus of Umbellifer». 



JOHN M. COULTER AND J. N. ROSE. 



(WITH PLATE II.) 



■ 



From the interesting collections made in Guatemala under 

 the direction of Mr. John Donnell Smith an Umbellifer was 

 sent to us for determination, which proves to be the type of 

 a new^ genus. We take pleasure in dedicating it to Mr. 

 Smith, whose name should be prominently connected with 

 the Guatemalan flora. 



DONNELLSMITHIA. — Calyx-teeth obsolete. Fruit 

 roundish-ovate, glabrous, strongly flattened laterally. Car- 

 pel flattened laterally, with equal filiform ribs, the intermedi- 

 ates distant from the laterals, and a thin pericarp wath no 

 strengthening cells (or the merest trace). Stylopodium 

 wanting. Oil-tubes numerous, rather large, almosc contigu- 

 ous about the carpel, those of the commissural face more 

 crowded and often larger. Seed invested by an oil-secret- 

 ing hiyer which may develop small tubes, especially in the 

 commissural region, the face with a deep and narrovv sulcus. 

 Slender glabrous perennial, from rather slender elongated 

 roots, with ternately compound leaves, narrow mostly entire 

 leaflets, with involucre mostly present and no involucels, and 

 yellovv flovvers in widely spreading loose umbels which are 

 long-peduncled or sessile. 



D. Onatemalensis. Glaucous : stem erect, simple or 

 branched, 8 to 30 in. high : leaves mostly near the base, 

 long-petioled, twice cr thrice ternate, wath lanceolate to ob- 

 long leaflets (i^ to 2 in, long, 3 to 6 lines broad), mostly en- 

 tire and with revolute callous margin : umbels on long di- 

 vergent slender peduncles or the latter often sessile, 5 or 6- 

 rayed, with involucre mostly present and of 3 or 4 trifid 

 bracts ; rays i to 2 in. long ; pedicels 2 to 3 lines 1< ng : fruit 



i 



000 



altitude, July, 1887 (no. 13 11 ex. Pl. Guat. Tuerckh., qu. 

 edid. John Donnell Smith). 



The new genus is probably most nearly related to Eulo- 

 phus, from which it diflers not only in its root and leaf char- 

 acters, but chiefly in its fruit and carpels being strongly hit- 

 erallv flattened, its seed-face having a deep and narrow sul 



