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196 UNITED STATES AND MEXICAN BOUNDARY. 
ыж ж * ж GetsELERIA, Klotsch. 
Croton GLANDULOSUM, Linn.; Micha. Fl. 2, p. 214; ЕП. Sk. 2, p. 648. Geiseleria glan- 
dulosa, Klotsch. On the Rio Grande, near Eagle Pass; Schott, Bigelow, (No. 638 Wright.) In 
the staminate flowers the calyx is 4—5-parted, the petals 4—6, and the stamens vary from 4 to 8. 
The calyx of the fertile flowers is unequally 4—5-parted. А common species in the southern 
and southwestern States, extending into Mexico and South America. 
In the herbarium of Berlandier are the following species of Croton which do not occur in any 
of the Mexican Boundary collections. 
CROTON TRICHOCARPUM (n. sp.): fruticosum ; foliis lanceolato-ovatis acuminatis vel acutis 
denticulatis supra glabriusculis subtus canescente stellato-pubescentibus ;. floribus dioicis, 
masculis longe spicatis sub-16-andris, petalis calyce sequalibus ; feemineis brevispicatis, petalis 
5 angustis calyce brevioribus; stylis profunde bipartitis ; fructibus hirsutissimis. Matamoras 
and San Fernando, Cohahuila; Berlandier, Nos. 1503, 1540, 2244, 3003, 3040, and 3212 (in 
part.) A shrub apparently about 2 feet high. Leaves 14 to 24 inches long and half an inch 
to more than an inch wide; (in Nos. 1503 and 3003 smaller and not acuminate,) obtuse, or 
somewhat acute at the base. Male spikes 2 to 3 inches long, the flowers on very short pedicels. 
Petals spatulate-lanceolate, ciliate with long hairs on the margin. Fertile spikes much shorter 
than the male; the flowers sessile. Sepals acute. Petals lanceolate linear. Disk a narrow 
ring. Capsule hispid with long hairs, which fall off more or less when the fruit is ripe. 
CROTON PENICILLATUM, Vent.; H. B. K. Nov. Gen. & Sp. 2, p. 84. Tampico; Berlandier, Nos. 
752 and 2172. ““ Plant 3-4 feet high." 
CROTON SYRINGÆFOLIUM, H. В. K. l. c., р. 67. Nos. 745 and 2165, Berlandier. No. 144 seems 
to be the same, with smoother leaves. : 
GYNAMBLOSIS MONANTHOGYNA, Torr. in Marcy’s Rep., p. 295. Croton monanthogynum, Micha. 
Fl. 2, p.215. 0. ellipticum, Nutt. Gen. 2, p. 225, (excl. syn.) Engelmannia Nuttalliana, 
”  Klotsch, 1. с. Argothamnia herbacea, Spreng. syst. 8, p. 848. Rocky places, Escondido Creek, 
Western Texas; Bigelow. (Nos. 441, 946, 1762, 2376 and 2532, Berlandier.) Nos. 649 and 
2059, Berlandier, are very poor specimens of what may be a variety of this plant; but they differ 
in being more densely pubescent; the male flowers with 10-12 stamens, and at least some of 
the female flowers with three styles. 
EREMOCARPUS SETIGERUS, Benth, Bot. Sulph., p. 53, t. 26. On the sea beach near San Diego, 
California ; Parry, Schott. Near San Felipe; Emory. This plant begins to flower and even 
bear fruit when it has scarcely formed a stem and all its leaves are in roseate clusters, spreading 
flat on the ground. 
APHORA HUMILIS, Engelm. & Gray, Pl. Lindh. 1, p. 54. Gravelly hills along the Rio Grande 
from New Mexico downward to the Gulf; March to May; Bigelow, Schott. San Antonio, 
Texas; Thurber. (Nos. 643 and 1797, Wright.) Petals of the fertile flowers longer than the 
oblong glands. "This and t the next species differ from A. mercurialina and A. pilosissima in the 
fertile flowers bearing true petals besides the glands of the disk; the former alternate with the 
sepals ; the latter opposite to them. The hairs, in all the species are simple, and those of the 
leaves and branches are fixed by the middle. 
АрновА LEVIS (Gray MSS.): glaberrima ; caulibus e basi lignoso ramosissimis ; foliis oblongis 
obtusis basi attenuatis; spicis axillaribus n folio жолына ANDER: 2109187 in flore 
masculo lanceolatis calycem paullo superantibus ; in flore foemi la is linearibus 
emarginatis sub-duplo longioribus. Western Texas ; Wright, No. 1798. Plant about | а span | 
