126 UNITED STATES AND MEXICAN BOUNDARY, 



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plant accords very nearly with tlie description and figure here quoted, but almost equally with 

 the T. polystachyum and T. hispidum, which seem to be scarcely distinct from T. nervosum. The 

 bracts are both appressed, and with spreading or even recurved tips, in the same specimen. The 

 base of tlie stem is more or less woody. 



TetrameeiuxM platystegium (n. sp.): caulc minutissime pubescente ; foliis oblongo-lanceolatia 



inferioribus obtusis superioribus acutiusculis utrinque scabriuscule puberulis ; spicis ovatis 

 terminalibus ; bracteis late cordatis acuminatis appressis membranaceis leviter 8-5-nervibus ; 

 calyce 5-partito ; corolla bracteis suba3quantibus, tubo gracili, limbi laciniis oblongis suba3quali- 

 bus. Ringgold barracks near Rio Grande City, on the Lower Rio G-randc ; May ; Scliott. Stem 

 icli branched ; the branches erect and slender. Leaves 1-2 inches long and 4-6 lines wide, 

 abruptly narrowed at the base into a petiole which is 2-3 lines long.' Spikes 1 to ]^ inch 

 long. Bracts 6-7 lines long and 5-6 lines wide, with a short mucronate acumination, closely 

 sessile^ somewhat roughly puherulous. Calyx much shorter than the tube of the corolla, the 

 segments subulate-lanceolate. Corolla purple, subhilabrate, the divisions obtuse. Stamens 2, 

 inserted at the summit of the tube of the corolla; anther-cells parallel, contiguous, rather acute 

 at the base. Stigma minute, capitate^ 2-lobed. Capsule narrowed at the base, orate above the 

 middle, 4-seeded. Seeds lenticular, muricate. In the 5-parted calyx this species differs from 

 Tetramerium, as the genus is characterized by Nees; but in T. ovatum, (Erst, the calyx is 

 also S-jmrted. 



A, 



VERBENACE^. 



mountains ; Septembe 



Korte 



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BoucuEA LiNiEOLiA, Gray in Sill. Jour. {ser. 2,) 16,2^. 98, (sine desc): suffruticosa ? 

 glaberrima; ramis sulcato-angulatis; foliis linearibus vel lanceolato-linearibus acutissimis inte- 

 gerrimis; spicis laxiusculis; floribus subsessilibus; bracteis subulatis calyce multo-brevioribus; 



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capsula calyce breviore. Valley of the San Pedro, Western Texas ; September, October; Schott. 

 (Nos. 436, 449, and 1509, WrightJ) Plants a foot or more high, with long, slender, erect branches. 

 Leaves 1 — 2 inches long and 1-2 lines wide. Spike 2-4 inches long. Calyx cylindrical; the 

 subulate teeth scarcely one- fourth the length of the tube. Capsule obtuse, villous at the summit. 

 BouciiEA SPATiiULATA (u. sp.)- sufiVuticosa; ramis teretibus ; foliis crebris obovatis integerrimis 

 obtusis vel brevissime mucronatis puberulis ; spicis laxis; floribus sessilibus;* bracteis foliaceis 

 oblanceolatis^ capsula calyce breviore acuta. Great Canon of the Rio Grande near Mount Carmel ; 

 October; Parry. Plant 1-2 feet high. Leaves about three-fourths of an inch long, often 

 fascicled in the axils and crowded on the short branchlets, somewhat scabro-puberulous. Bracts 

 nearly as long as the calyx. Tube of the corolla nearly three-fourths of an inch long, and the 

 limb half an inch in diameter. 



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BouciiEA EiiEENBERGii, Cham.; Scliauer in DC. Prodr. 11, p. 558. Sonora, Mexico ; Thurher. 



(No. 1508, Wright.) 



LirpiA WEiGiiTir, Gray in Sill. Jour. I. c. Aloysia scorodonoicleSj H. B. K. nov. Gen. & 

 Sp.l^p. 260: ramis snbtetragonis patentibus, junioribus pedunculisque pulvereo-canescentibus; 

 foliis oppositis ovatis in petiolum brevem angustatis obtusis crenatis reticulato-rugosis supra 

 scabro-hirtis subtus tomentoso-candicantibus ; pedunculis axillaribus folium subtequantibus ; 

 spicis cylindricis laxiusculis ; bracteis ellipticis acutis calyce longioribus; calyce ovato birsuto, i 



dentibus ovatis. Eocky hills along the Cibolo of the Rio Grande, August; near tbe Hot ^ 



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