APETALOUS EXOGENOUS PLANTS. 457 



12-18' high, slender, terete, paniculately branched above ; 

 leaves 2'-3' long, mostly about a line wide, but sometimes 

 2 lines; inflorescence a loose cymose panicle; involucres 

 sometimes solitary in upper axils and the pedicels recurved; 

 perianth f in length, funnel-form, with a long narrow 

 tube; the limb of a bright crimson, 5-lobed, with the lobes 

 notched; stameiis and styles exserted; fruit pubescent, 

 strongly 5-ribbed and slightly rugose. — Torrey, High- 

 lands between Nueces Eiver, west to San Pedro. 



0. AGGREGATUS, Vahl. MiKABILIS AGGREGATA, CaV. 



Smith's Eun, Western Texas. 



. 0. ALBIDUS, 0. HIRSUTUS, 0. ANGUSTIFOLIUS, are all 



found in Western Texas, but the writer has been informed 

 of nothing concerning their distinctive characteristics. 



BOERHAAVIA, L. 



Floioers perfect ; involucre none ; calyx-iuhQ cylindrical 

 or obconical, 5-ribbed, the limb colored, funnel-shaped, 

 5-lobed, deciduous ; stamens 1-4; anthers minute, round- 

 ish; style ^ItwdieY ', stigma ohiw^e \ embryo folded. — Annual 

 he7'bs, with diffuse branching stems, and opposite ovate 

 or rounded leaves; flowers small, in solitary or panicled 

 clusters. 



B. ERECTA, L. Stems ascending, branched from the base, 

 smooth, tumid at the joints; branches alternate; leaves 

 ovate or roundish, acute or mucronate, often more or less 

 cordate, wavy along the margins, whitened and minutely 

 dotted with black beneath ; clusters 3-5-flowered, in ample 

 panicles; stamens 2; fr^iit smooth, obconical, truncate, 

 strongly ribbed. July-September. Stem l°-3° long; leaves 

 rather thick, 2-3' long; floivers small, purple. 



B. HIRSUTA, Willd. Stem diffuse, alternately branched, 

 minutely pubescent, hirsute above ; leaves ovate or oblong- 

 ovate, mucronate, obtuse at the base, undulate, smooth, 



20 



