3l6 THE WEST VIRGINIA FLORA 



PSEUDOTAENIDIA Mackenzie. 



Glabrous and glaucous erect perennials from stout hori- 

 zontal to perpendicular rootstocks. Leaves ternately de- 

 compound, the leaflets entire. Umbels borne on terminal 

 and lateral peduncles, compound, the rays very unequal in 

 length. Involucre and involucels none or rarely of one o r 

 two bractlets. Corolla not seen.* Calyx-teeth short, but 

 evident. Fruit thick, strongly flattened dorsally, oval or 

 obovate, glabrous. Dorsal and intermediate ribs of carpel 

 filiform and very much narrower than the intervals, coming 

 together at base and apex to form short prominent ridges; 

 lateral ribs thick, broadly winged and contiguous to those 

 of the other carpel so^as to form a broad one-edged margin 

 around the fruit, nerved dorsally at the inner margin and 

 also near the outer margin. Oil-tubes solitary in the inter- 

 vals or often two in the intervals nearest the lateral ribs; 

 two entirely developed and two partially developed on the 

 commissural side. Top of fruit thickened by the converging 

 ribs, but stylopodium absent or much depressed. Seed-face 

 plane, the back rounded. 



P. MONTANA Mackenzie, Torreya 3:159 (1903). 



Plant 4-8 dm. high, entirely glabrous; stems striate; 

 leaves several, the blades two or three times ternately com- 

 pound; the segments entire, ovate or oblong-lanceolate, oval 

 or oblanceolate, glaucous and strongly veined beneath, ses- 

 sile or stalked, 10-30 mm. long, 6-20 mm. wide, mucronate, 

 often inequilateral at base ; petioles dilated at base, striate 

 and clasping the stem; peduncles 6-20 cm. long; rays of 

 umbels 8-12, 1-5 cm. long; rays of umbellets usually slightly 

 more numerous, 3-7 mm. long; fruit 5-6 mm. long, 4 mm. 

 wide, the lateral ribs i mm. wide. 



The plant exactly resembles Taenidia integerrima (L.) 

 Drude in everything except the fruit, 



In dry open woods, in a clayey soil intermixed with loose 

 rocks. Greenbrier : side of Kate's Mountain, August 29, 

 1903 (Mackenzie). 



SIUM Linn. 



S. CICUTAEFOLIUM Gmel. 



In swampy places. Randolph : on Tygart Valley River 

 near Huttonville (Greenman 434). 



* Almost certainly yellow. 



