122 UNITED STATES AND MEXICAN BOUNDARY. 



exserted ; anthers 2-cellecl, bifid at the base, mucroniilate at the summit ; filaments slender, 



ot the tube of the corolla. Ovary oblong-conical, the 



middle 



base surrounded by a glandular ring. Style conspicuously exserted, filiform, smooth, except at 

 the base, which is a little pubescent, somewhat clavate at the summit ; stigma small, capitate. 

 Capsule oblong, apiculate, 2-celled, septicidal ; valves 2-cleft at the summit; placentae thick, 

 adnate to the axis. Seeds numerous, imbricated, the testa loose, cristate at both ends twice the 

 length of the nucleus. Embryo straight. We have seen one or two pentamerous flowers. 



genus IS 



H 



V. 



have seen one or two pentamerous flowers. This 

 3ry, United States Commissioner to the Mexican 

 Boundary Survey, who has taken the liveliest interest in the botany of the region explored 



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under his command, and has afforded every facility to the gentlemen who had that department 

 of science in charge. Mr. Miers, to whom we sent specimens of this plant, thought it might be 

 referred to the tribe Buddleiee. Indeed it is nearly related to Buddleia itself. 



ACANTHACE^. 



Elytraria TRiDENTATA, VaJiL var. CAULESCENS, Nces^ in DC. Prodr, 11, p. 64. Guadaloupe 

 canouj etc. Sonora ; Cajyt. E. K. SmtiJij Schoitj Thiirher, Lower California ; Mr. Rich. (No. 



16-17, Wright. No, 1207, Coulter; Mexico.) 



CALoniANEs OBLONGiFOLius, D. DoTh. in Siocet FL Gard. 2, t. 181 ; Nees^ L c. p. 107. Valley 

 of the Santa Cruz river, etc., Sonora; Gapt. E. K. Smithy Thurher. Plains between Van Horn's 



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Wells and Muerte^ and down the valley of the Eio Grande to the Gulf of Mexico. (No. 1462, 



Wfigld.) 

 C OBLOXGiroLius, var. Texexsis, Nees^ I. c.,p. 108. C. linearis, Engclm, & Gray, PI, Lindh. 



2j p. 50, (adnot.) Common along the middle Kio Grande on both sides-of the river, and in 

 Sonora ; flowering from April to September. (Nos. 1463 and 1464, Wright.^ 



CRYPiiiANxnus Baeeadensis, NeeSj EeL Sem. Sort. Vratid. 1841^ din EC. Frodr. 11, p. 197. 

 Bipteracanthus nudiflorus, Engdm. & Gray^ I. c-; P* 21. Moist places in central and western 

 Texas, particularly along the lower Rio Grande; b'cJiott^ Bigelow. (Nos. 1454 and 1455, Wright.) 

 Euellia alba, Nees is, perhaps, not distinct. 



BiPTERACANinus? suFFRUTTcosus (n. sp.) : caule glabro inferno fruticoso erecto; foliis obovato- 

 oblongis glabriusculis subcoriaceis basi in petiolem attenuatis, margine retrorsum ciliatis; 

 peduncLilis axillaribus l-floris ; bracteolis oblongo-lanceolatis ; caljcis laciniis lanceolato-line- 

 aribus tubo coroll£e elongate gracili subtriplo brevioribus. Presidio del Norte ; July — August ; 

 Parrij. Sides of rocky bills, valley of the Pecos. No. 1461^ Wright. Plant apparently about 



a foot high. Leaves 1-1 1 incb long, acute or obtuse. 



pubescent. Pedun- 



cles 2-4 lines long, tbe bracts a little longer than tbe calyx. Segments of the calyx 

 sparsely ciliate. Corolla white ; the tube 1^ inch long, very slender, somewhat dilated at the 

 summit; lobes of the limb roundish- obovate. Stigma simple, (the inferior lobe abortive) 

 Capsules 4-seeded ; seeds hispid. This is the only suffruticose species of this genus known 

 within the limits of our Flora. 



& 



Mountains and hill sides 



along the Pio Grande from El Paso to the mouth of the Pecos ; March — April. (N 



- o 



Flowers pale purple. 



Wright.) Stem branching from a thick wood base. 



ScHAUERiA PAEYiFOLiA (n. sp,) • suifruticosa e basi ramosorissima glanduloso-pubescens ; foliis 

 oblongis ovatisve acutis ; spicis terminalibus subpaniculatis interruptis ; floribus oppositis sessili- 



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