118 PROCEEDINGS OF THE AMERICAN ACADEMY 



33. A. Greggii. Slender, 6-15 inches high, leafy; leaves alternate 

 or the lower opposite, oblong or spatulate, 3-6 lines long, obtuse or 

 acutish, cuneate at base, mostly sessile ; flowers in small axillary 

 clusters or slender interrupted nearly naked spikes ; calyx 5-cleft ; 

 bracts united only at base, cuneate-orbicular, becoming 1|— 3 lines 

 broad, margined from below the middle, the margin dentate and the 

 convex sides usually tooth crested. — New Mexico to Sonora. 



Obione canescens, var. Torrey, Bot. Mex. Bound. 183. 

 Obione acanthocarpa. Torrey, Bot. Mex. Bound. 183, in part. 



Collectors: — 1346 Berlandier; 462 Gregg; Emory; Thurber; Bigelow; 

 572, 1137, 1138 Wright. 



34. A. OPPOSiTiFOLiA. Woody at base and apparently perennial, 

 erect, 1 foot high, strict, branched, leafy ; leaves thick, 1-2 lines long, 

 nearly equalling or exceeding the nodes, mostly opposite, oblong-lanceo- 

 late, acutish, sessile and broadest at base ; flowers axillary, sessile, 

 dioecious (?) ; fruiting bracts united, orbicular, a line broad, shortly 

 pedicelled, the margin radiately toothed, sides 3-nerved, not appen- 

 daged. — In the Rio Grande Valley on the Mexican side, collected 

 only by Berlandier (No. 3201, " Matamoras to San Fernando"). 



§ 9. Fruiting bracts orbicular or ovate, membranous or spongy 

 and not at all herbaceous, free or partly united, 1-2 lines broad, 

 not margined nor appendaged, more or less compressed, nearly 

 entire : radicle ascending (superior in A. Torreyi) : leaves alter- 

 nate, entire, ovate to rhombic or subhastate : tall and shrubby, 

 dioecious, the flowers in naked axillary and terminal panicled 

 spikes. 



35. A. LENTiFORMis. Diffusely branched, 2-12 feet high, the 

 branches terete, unarmed ; leaves ovate- to oblong-rhombic or sub- 

 hastate, ^1^ inches long, cuneate at base; calyx 5-pazted ; bracts 

 strongly compressed, united to above the middle, the circular free 

 margins obscurely crenate ; styles short ; seed § of a line broad, dark. — 

 Southern California (Pose Creek and Ft. Yuma) and eastward through 

 Arizona. 



Obione lentiformis. Torrey, Sitgreave's Eep. 169, t. 14 (and Flora, 38. 362) ; 



Pac. R. R. Rep. 4. 129. 

 Obione Barclayana. Dur. & Hilg. Pac. R. R. Rep. 5. 13; not of Benth. 



Torrey, Ives's Rep. 25. 

 Obione acanthocarpa, var. (?) Torrey, Bot. Mex. Bound. 183. 



Collectors : — Woodhouse ; Emory ; Bigelow ; Heermann ; Thomas ; 

 Palmer. 



