28 



CORRIGIOI.ACEAE. 



Vol. II. 



I 



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

 ing \\liill<jw-\\<Ji'l. Xaihvort. I'lg. 1719. 



Achyriinllics dichvloiiia 1.. Maiit. 51. 1767. 

 Paronychia dichoioma Nutl. Gen. I ; 159. 1818. 



Much branched from the tliick woody base, gla- 

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

 strooth, all acute, nuicronate or bristle-tipped ; 

 stipules entire, silvery, often s"-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 \Miitlo\v-\vort. Fig. 1720. 



P.Jamcsii deprcssaT.&.G.'Fl.'N. hm.s.: 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, dilTering in 

 shorter bracts and stipules, does not appear specifi- 

 cally distinct. 



6. Paronychia sessiliflora Xutt. Low Whit- 

 low-wort. Fig. 1 72 1. 



Paronychia sessiliflora Nutt. Gen. i : i6o. 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 upperinost recurved-spreading, mucronate or 

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

 tlie leaves ; bracts entire, mostly shorter than the 

 flowers; flowers sessile, solitary at ends of branch- 

 lets; calyx i"-il" 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. 



