OF AETS AND SCIENCES. 117 



30. A. ACANTHOCARPA. (OMone, Torrey, Bot. Mex. Bound. 183, 

 mostly.) Erect, 1-2 feet high or more, branched, leafy ; leaves oblong- 

 lanceolate or oblanceolate, often subhastate, ^IJ inches long, acute or 

 acutish, cuneate to a short petiole, usually undulate, sinuately toothed 

 or entire ; flowers dioecious, the male clusters dense in naked terminal 

 panicled spikes ; calyx 5-cleft ; fertile clusters axillary, few-flowered ; 

 bracts sessile or pedicelled, lanceolate, the linear apex only free, becom- 

 ing thick and spongy and 4-6 lines long, the margins gash-toothed and 

 the sides sti'ongly appendaged with rigid flattened processes ; seed a line 

 long, filling the cavity. — From the Rio Grande Valley to Sonora ; 

 collected by Gregg (459) and Wright (573, 1739). 



31. A. LEUCOPHYLLA, Dietrich. Stems decumbent or ascending, 

 stout, hardened at base, leafy ; leaves thick, obovate or orbicular to 

 elliptical, i— H inches long, obtuse or acutish, cuneate at base, sessile, 

 entire ; flowers in loose axillary clusters ; calyx large, 5-cleft ; bracts 

 sessile, ovate, united, becoming 2|— 3i- lines long and spongy, the tips 

 free, margin entire or somewhat toothed, the sides usually tuberculately 

 crested ; seed Ih lines long. — On the seashore from San Francisco to 

 Santa Barbara, California. 



Obione leucophi/Ua. Moquin, DC. Proclr. 132. 109. Benth. PI. Hartw. 332. 



Bolander, Catalogue, 25. Torr. Bot. Wilkes's Exp. 437. 

 Atriplex leucophylla. Dietrich, Sjni. 5. 536. 



Collectors : — Chamisso ; 1934 Hartweg ; Wilkes ; 425 Bolander ; 309 

 Brewer; Kellogg & Harford. 



** Fruiting bracts more or less compressed, mostly small: leaves 

 numerous, about 3 lines long or less, entire, more or less opposite 

 in A. Greggii and oppositlfoUa. 



32. A, POLTCARPA. Erect, 2-3 feet high, diflfusely much branched, 

 the branches terete, slender, rigid, leafy ; leaves thick, mostly minute, 

 J— 3 lines long, obovate to spatulate, obtuse, cuneate at base, sessile ; 

 flowers in dense paniculate naked spikes ; calyx deeply 5-cleft ; bracts 

 sessile, free, compressed, cuneate-orbicular, becoming 1-H lines broad, 

 spongy and not at all indurated, the entire margin above the base finely 

 gash-toothed or sharply dentate, the sides usually more or less promi- 

 nently tuberculate ; styles short ; pericarp loose ; seed |- line broad, 

 the radical highly lateral. — From Fort Mojave eastward through 

 Arizona. 



Obione polijcarpa. Torrey, Emory's Rep. 150 ; Pac. R. R. Rep. 4. 130 ; Ives's 

 Rep. 25. 



Collectors: — Emory; Bigelow ; Cooper; Palmer. 



