126 ; UNITED STATES AND MEXICAN BOUNDARY. 
plant accords very nearly with the description and figure here quoted, but almost equally with 
the T. polystachyum and T. hispidum, which seem to be scarcely distinct from T. nervosum. "Phe - 
bracts are both appressed, and with spreading or even recurved tips, inthe same specimen. The 
base of the stem is more or less woody. 
TETRAMERIUM PLATYSTEGIUM (n. sp.): caule dito ENA pubescente ; foliis oblongo-lanceolatis 
inferioribus obtusis superioribus acutiusculis utrinque scabriuscule puberulis; spicis ovatis 
terminalibus ; bracteis late cordatis acuminatis appressis membranaceis leviter 3-5-nervibus ; 
calyce 5-partito ; corolla bracteis subaequantibus, tubo gracili, limbi laciniis oblongis subæquali- 
bus. Ringgold barracks near Rio Grande City, on the Lower Rio Grande ; May; Schott. Stem 
much 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—8 lines long. Spikes 1 to 14 inch 
long. Bracts 6-7 lines long and 5-6 lines wide, with a short mucronate acumination, closely 
sessile, somewhat roughly puberulous. Calyx much shorter than the tube of the corolla, the 
segments subulate-lanceolate. Corolla purple, subbilabrate, 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, ovate 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, Wrst. the calyx is 
also 5-parted. 
VERBENACE, 
BoucHEA LINIFOLIA, Gray in Sill. Jour. (ser. 2,) 16, p. 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; 
capsula calyce breviore. Valley of the San Pedro, Western Texas ; September, October; Schott. 
(Nos. 436, 449, and 1509, Wright.) Plants a foot or more high, vith 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. 
ВосснЕА SPATHULATA (n. sp.): suffruticosa; ramis teretibus ; foliis crebris obovatis integerrimis 
obtusis vel brevissime mucronatis puberulis; spicis laxis; floribus sessilibus; bracteis foliaceis 
oblanceolatis, capsula calyce breviore acuta. Great Сайоп 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 axiis 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. 
BovcugA Енвкхвевап, Cham.; Schauer in DO. Prodr. 11, p. 558. Sonora, Magico; Thurber. 
(No. 1508, Wright.) 
LIPPIA WRIGHTII， Gray in Sill. Jour. 1. c. Aloysia c puse. H. B. K. nov. Gen. & 
Sp. 2, , p. 260: ramis subtetragonis patentibus, junioribus ped pulvereo-canes tibus ; 
foliis oppositis ovatis in petiolum brevem angustatis obtusis ee reticulato-rugosis supra 
scabro-hirtis subtus tomentoso-eandicantibus ; pedunculis axillaribus folium subsquantibus ; 
spicis cylindricis laxiusculis ; bracteis ellipticis acutis calyce longioribus; calyce ovato hirsuto, 
dentibus ovatis. Rocky hills along the Cibolo of the Rio Grande, August; near the Hot 
Springs, and on the Burro mountains ; September, November ; Bigelow. Presidio del Norte, 
