28 



CORRIGIOLACEAE. 



Vol. II. 



4. Paronychia dichotoma (L.) Nutt. Fork- 

 ing Whitlow-wort. Nailwort. Fig. 1719. 



Achyranthes dichotoma L. Mant. 51. 1767. 

 Paronychia dichotoma Nutt. Gen. i: 159. 1818. 



Much branched from the thick woody base, gla- 

 brous or puberulent, 4-14' tall. Leaves subulate, 

 smooth, all acute, mucronate or bristle-tipped; 

 stipules entire, silvery, often 5"-6" long, tapering 

 into a slender awn ; cyme loose, its branches ascend- 

 ing; calyx 2" long, glabrous or merely puberulent, 

 the awns of its segments divergent, short; stami- 

 nodia of minute bristles hardly one-fourth as long 

 as the filaments; styles nearly as long as the peri- 

 anth-segments, the stamens fully one-half as long. 



In dry soil, Maryland to North Carolina, west to 

 Arkansas and Texas. July-Oct. 



5. Paronychia depressa (T. & G.) Nutt. 

 Depressed Whitlow-wort. Fig. 1720. 



p. Jamesii depressa T.&G.Fl.N. Am. 1 : 171. 1838. 

 Paronychia depressa (T. & G.) Nutt.; A. Nelson, 

 Bull. Torr. Club 26: 236. 1899. 



Root deep, woody, the numerous prostrate or 

 spreading branches 3' long or less, forming dense 

 mats, roughish-puberulent. Leaves linear, 3"- 

 7" long, cuspidate ; stipules silvery, as long as 

 the leaves or shorter, long-acuminate ; flowers 

 in small cymes, or solitary in the axils ; calyx 

 pubescent, about li" long, exceeded by the 

 bracts; awns of the sepals divergent-ascending; 

 filaments shorter than the slender staminodia. 



In dry soil. South Dakota to Nebraska and Wy- 

 oming. June-Aug. 



Paronychia diffusa A. Nelson, of South Dakota, 

 Nebraska, Wyoming and Colorado, differing in 

 shorter bracts and stipules, does not appear specifi- 

 cally distinct. 



6. Paronychia sessiliflora Nutt. Low Whit- 

 low-wort. Fig. 1 72 1. 



Paronychia sessiliflora Nutt. Gen. i: 160. 1818. 



Densely tufted from stout thick roots, low, the 

 internodes very short and hidden by the imbricated 

 leaves and stipules. Leaves linear-subulate, gla- 

 brous or puberulent, the lowest erect and obtuse, 

 the uppermost recurved-spreading, mucronate or 

 bristle-pointed ; stipules 2-cleft, usually shorter than 

 the leaves ; bracts entire, mostly shorter than the 

 flowers ; flowers sessile, solitary at ends of branch- 

 lets ; calyx i"-iA" long, its segments hooded at the 

 apex, tipped with at length divergent awns of nearly 

 their own length ; staminodia about as long as the 

 filaments. 



In dry soil, Saskatchewan to Montana, Nebraska and 

 Colorado. Aug.-Sept. 



