X YCT AGIN ACE AE. 



4. Allionia linearis Pursh. Narrow-leaved 

 Umbrella-wort. (Fig. 1419.) 



Allionia linearis Pursh, Fl. Am. Sept. 728. 1814. 

 Calymenia angustifolia Nutt. Fraser's Cat. Name onlv. 



1813. 

 Oxybaphus angustifolius Sweet, Hort. Brit. 429. 1830. 



Stem slender, terete or somewhat 4-angled below, 

 glabrous,glaucous,i-4X tall, erect, the branches and 

 peduncles sometimes puberulent. Leaves linear, thick, 

 r-nerved, i / -2^ / long, i^ // -4 // wide, obtuse or acute 

 at the apex, sessile or the lower occasionally short-peti- 

 oled; involucre about 3-flowered, green before flow- 

 ering; perianth purple, longer than the involucre; sta- 

 mens and style exserted; fruit commonly roughened 

 in the furrows between the 5 prominent ribs. 



In dry soil, Minnesota to Utah, south to Texas and 

 Mexico. June-Aug. 



5. Allionia Bodini (Holzinger) Morong. Bodin's Umbrella-wort. (Fig. 1420. ) 



Oxybaphus Bodini Holzinger, Contr. Nat. Herb, i: 287. 



pi. 21. 1893. 

 Allionia Bodini Morong, Mem. Torr. Club, 5: 355. 1894. 



Low, glabrous or minutely pubescent, stem whit- 

 ish, diffusely branched, slender, 2 '-5' high, the 

 branches divergent. Leaves narrowly linear, sessile, 

 YZ'-I}^' long, \" wide or less, slightly narrowed at 

 both ends, fleshy; involucres solitary and short -pe- 

 duncled in the upper axils, finely pubescent, about 

 3" broad when mature, 5-lobed to about the middle, 

 the lobes ovate-oblong, acute; fruit narrowly obovoid, 

 obtusely 5-ribbed, very pubescent, 2^ // high. 



In dry soil, eastern Colorado and western Kansas. 

 June-July. 



6. Allionia Bushi Britton. Bush's 

 Umbrella-wort. (Fig. 1421.) 



Allionia Bushi Britton, Bull. Torr. Club, 22: 223. 



1895- 



Low, glabrous, somewhat fleshy, stem nearly 

 white, diffusely branched, about 8' high, the 

 branches slender, widely divergent. Leaves nar- 

 rowly linear, sessile, i'-3' long, \"-\ l /t" wide, 

 blunt, their width almost uniform from base to 

 apex; involucres clustered at the ends of the 

 branches, at first campanulate and longer than the 

 flowers, at length rotate and becoming 10" broad, 

 membranous, pubescent, finely reticulate-veined, 

 their short lobes semicircular, rounded, the mid- 

 veins prominent. 



In dry ground; Jackson Co., Missouri. Aug. 



a. ABRONIA Juss. Gen. 448. 1774. 



Annual or perennial herbs, with opposite petioled thick entire leaves, one of each pair 

 somewhat larger than the other. Stems ascending, erect or prostrate, branching, mostly glan- 

 dular-pubescent, with clustered or solitary numerous-flowered involucres on long axillary 

 peduncles. Flowers sessile, usually conspicuous. Perianth-tube elongated, tubular or fun- 

 nelform, the limb spreading, 5-lobed, the lobes obcordate or emarginate. Stamens 3-5, un- 



