300 FLORA OF TEXAS. 



TIEDEMANNIA, DC. 



Margin of calyx 5-toothed ; petals broadly ovate, with a 

 narrow, inflexed point; fruit much compressed dorsally, 

 obovate; carpels with 5 filiform somewhat carinate ap- 

 proximated equal ribs, the lateral ones dilated into a mem- 

 branaceous margin nearly as broad as the dorsal disk; 

 intervals with single large vittae; seed flat.— A glabrous 

 biennial ; fistulous stemSf and leaves reduced to terete pe- 

 tioles ; floioers white. 



T. TERETiFOLiA. Stem 2°-6° high, erect, fistulous, 

 branching above; leaves or rather petioles 4-8' long, 

 2"-4" in diameter, tapering to the summit, divided by nu- 

 merous transverse membranous partitions; principal U7n- 

 iel of 10-15 slender rays; fruit about 3" long. — Gray and 

 TojTcy. 



CH^ROPHYLLUM, L. 



Margin of the calyx obsolete; petals obovate, emar- 

 ginate, with an inflexed point; carpels with 5 obtuse 

 equal ribs ; intervals with single vittae. — Perennial, bien- 

 nial, or annual herbs; leaves decompound, the segments 

 toothed or many-cleft; fruit oblong or linear, tapering at 

 the apex, contracted at the base; iuvolucel many-leaved; 

 involucre few-leaved or none ; floiuers white, rarely yellow. 



C. PROCUMBEXS. stem 6-18' long, usually decum- 

 bent, but sometimes erect or oblique, when young more or 

 less hairy, but often nearly glabrous, except the sheath and 

 margin of the leaves ; lobes of the leaves l"-2" wide, mostly 

 obtuse; umbels opposite the leaves, usually sessile, of 

 2— 3-4 rays; ifivohi ere 'none; involucels of 4-5 ovate-oblong 

 leaflets; fruit narrowly oblong, abruptly contracted at 

 the summits ; ribs scarcely as broad as the intervals. — 

 Gray and Torrey. 



C. Taixturieri. Hook and Arn. Stem decumbent or 



