STANDLEY—ALLIONIACEAE OF THE UNITED STATES. 373 
Specimens eramined: 
New Mexico: La Luz Canyon, 1901, Wooton; Organ Mountains, 18938, 
Wooton; Organ Mountains, 1881, Vasey; Carlsbad, 1902, Tracy. 
Texas: Devil's River, Valverde County, 1900, Eggert; El Paso, 1884, 
Jones 4216; Junction City, Reverchon 1584; Big Springs, 1900, Eggert ; 
1849, Wright 618; Bone Spring, 1889, Nealley 455, 
Mexico: Near Chibuahua, 1885, Pringle 698; Saltillo, 1898, Palmer 171; 
Tehuacan, Puebla, 1905, Purpus 1831; Ixmiquilpan, Hidalgo, 1905, 
Purpus 1438; Chihuahua, 1886, Pringle 9ST; between Monterey and 
Cerralvo, 1847, Wislizenus 340; 1848-49, Gregg. 
2. Senkenbergia crassifolia Standley, sp. nov. 
Perennial, 60 to 100 em. high; stem rough-puberulent below, glabrous or 
glandular-viscid above; leaf blades thick, ovate, obtuse, broadly cuneate or 
{truneate at the base, puberulent on both surfaces, 20 to 30 mm. long and 15 to 
20 mm. wide; petioles puberulent, as long as the blades or a little shorter ; 
flowers (not seen) in racemes, these in diffuse panicles, each raceme with very 
small bract-like leaves at the base, each flower subtended by a soon deciduous 
lanceolate bract; fruit reflexed on the very short pedicels, about 7 mm. long, 
gibbous, truncate above, tapering below, obscurely 10-nerved. 
This species is near S. gypsophiloides, but differs in the panicled inflo- 
rescence with racemes subtended by bract-like leaves, and in the pubescent stems 
and broader and more thickly puberulent leaves. Type in the herbarium of 
the University of California, collected at Saltillo, Coahuila, Mexico, 1898, 
Palmer 172. 
13. COMMICARPUS Standley. 
Commicarpus Standley, gen. nov. 
Boerhaavia l., in part. 
Perennial plants with long and slender, climbing or reclining stems; leaves 
thin, mostly ovate-cordate, with conspicuous petioles, entire, opposite; flowers 
in umbels on moderately long pedicels; perianth short-funnelform, with a very 
short tube below the broad limb; flowers small; stamens exserted; fruit rather 
obscurely 10-ribbed, clavate, with numerous, rather large, mucilaginous glands 
scattered over its surface. 
The plants included here have always passed as Boerhaavias, but they differ 
widely from the plants of that genus in the habit of the plant, form of the 
fruit, and shape of the perianth. Boerhaavia scandens and several related 
species were included by Doctor Heimerl® in the section Adenophorae of the 
genus Boerhaavia. 
Type species, Boerhaavia scandens T. 
The name alludes to the viscid fruit. 
KEY TO THE SPECIES. 
Pedicels glabrous; glands scattered irregularly over the fruit__ 1. C. scandens. 
Pedicels pubescent; glands arranged in horizontal rows about 
the fruit_______-_-_-_-_--------_---------------+---------+- 2. C. brandegei. 
1. Commicarpus scandens (L.) Standley. 
Boerhaavia scandens L. Sp. Pl. 8. 1753. 
Boerhaavia grahami A. Gray, Am. Journ. Sci. IT. 15: 328. 1853. 
Type locality, “In Jamaica ad urbem jago de la vega.” 
mlb, 
@Engler & Prantl, Pflanzenfam, 8°: 26, 
