196 UNITED STATES AND MEXICAN BOUNDARY. 



r 





^r *P *1* T* 



Geiseleeia^ Klotsch, 



Croton glaxdulosum, Linn,; Michx. Fl. 2, p. 214 ; Ell. Sk. 2, p. 648. Geiseleria glau- 



Klolsch 



Wright A In 



the statninate 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. A 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 glahriusculis suhtus canescente stellato-puhescentihus ; florihus dioicis, 

 masculis longe spicatis suh-16-andris, petalis calyce ^qualibus ; foemineis brevispicatis, petalis 

 5 angustis calyce hrevioribus ; 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 1^ to 2^ inches loi 

 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 



o 



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. 



Ckoton penicillatum, Vent.; H. B. K. Nov. Gen. & Sp. 2, p. 84. Tampico ; Berlandier ^ Nos, 

 752 and 2172, '' Plant 3-4 feet high/' 



Croton syring^folium, H. B. K. I. c,^p. 67. Nos. 745 and 2165, Berlandier. No. 744 seems 



to be the same, with smoother leaves. 

 (^Gyfamblosi^monanthogyna, Torr, in 3Iarcy's Bep.^ p. 295. Croton monanthogynum, Michx. 

 Fl. 2, p. 215, C. ellipticum, Nutt. Gen. 2, p. 225, Cexcl, syn.) Engelmannia Nuttalliana, 

 Klotschy I. c. Argothamnia herbacea, Spreng. syst. 3,^, 848. Rocky places, Escondido Creek, 

 Western Texas; Bigelow. (Nos. 441, 946, 1762, 2376 and 2532, Berlandier.) Nos. 649 and 

 2059, Berlandier y 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, Benili. Bot. Sulpli,, 

 California ; Parry ^ ScJiott. Near San Felipe ; 



, p. 53, t. 26. On the sea beach near San Diego, 

 ! ; 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^ PI. Lindh. l^p. 54. Gravelly hills along the Eio Grande 

 from New Mexico downward to the Gulf; March to May; Bigelow^ Schott. San Antonio, 

 Texas ; Thurher. (Nos. 643 and 1797, Wright,) Petals of the fertile flowers longer than the 

 oblong glands. This and 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. 



Aphoea l^vis (Gray MSS.): glaberrima ; caulibus e basi lignoso ramosissimis ; foliis oblongis 

 obtnsis basi attenuatis; spicis axillaribus paucifloris folio multum hrevioribus; petalis in flore 

 masculo lanceolatis calycem paullo superantibus ; in flore foemineo lanceolatis glandulis linearibus 

 emarginatis sub-duplo longioribus. Western Texas ; Wright^ No. 1798. Plant about a span 



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