134 UNITED STATES AND MEXICAN BOUNDARY. 
attached. Stamens всагсе1у exserted; the anthers approximated in pairs; the inferior (longer) 
pair with one of the cells abortive; lower pair with cordate, 2-celled anthers, the cells some- 
what divaricate. Style long and filiform, not at all bifid at the summit. Nutlets depressed- 
globose, horizontal, nearly a line in the transverse diameter, roughened with minute tubercles. 
Seed conduplicate, or bent at an acute angle, so that the cotyledons are somewhat horizontal 
and incumbent on the radicle. One or more of the nutlets are commonly abortive. 
Mr. Bentham (in the introduction to his Gen. & Spec. Labiat., p. xxix) says, that the embryo 
of all Labiatz that he had examined is either straight or only slightly curved; the only excep- 
tion being in Scutellaria, in which **it is curved backward in a peculiar manner."  Salazaria 
exhibits the same peculiarity, that is, the cotyledons are incumbent. The rather short radicle 
is not applied close to the cotyledons, but makes an acute angle with them. This results from 
the flexure of the carpel itself, which commences at an early period, and at last the vertex 
approaches the base, as in Menispermum. The nutlets in Scutellaria are always more or less 
roughened with minute tubercles, or with thick scales which are imbricated retrorsely. In 8. 
parvula there is a distinct horizontal wing, free from the tubercles, and surrounding the nutlet, 
thus making an approach to Periloma, in which they are narrowly 4-winged. 
It is evident that Salazaria makes a near approach to Scutellaria, but its nearly regular and 
bladder-like inappendiculate fructiferous calyx, in which there is scarcely any distinction of 
upper and lower lip, distinguishes it sufficiently from that genus. 
PHYsosTEGIA VIRGINIANA, Benth. Lab. p. 504. Dracocephalum Virginianum, Linn. Sp. p. 
828. Western Texas; Wright. 
BRAZONIA TRUNCATA, Engelm. & Gray, Pl. Lindh. 1, p. 47; Benth l. c. p. 434. Near Austin, 
Texas, May; Wright. 
MARRUBIUM VULGARE, L.; Benth. in DC. Prodr. 12, p. 453. Santa Cruz, Sonora, May; Capt. 
E. K. Smith. Doubtless introduced by the Spaniards. 
、 БтАСНҮБ COCOINEA, Jacq.; Benth. in DC. Prodr. 12, p. 467. Near the San Pedro river and in 
other parts of Sonora; also in Chihuahua; Thurber. Tubac, Sonora, March; Parry. Copper 
_— Mines, New Mexico, August; Bigelow. (No. 1527, Wright.) Our plant is smoother than the . 
ordinary of the species. We have specimens of a Stachys, collected by Dr. Bigelow in rocky 
places near the Limpia mountains, which we think is a variety of S. coccinea, but the flowers 
are much smaller. 
STACHYS AGRARIA, Cham. & Schlecht. in Linnea, 5, p. 100; Benth. 1. с. p. 479. S. umbrosa, | 
Scheele in Linnea, 22, p. 295. Near Santa Antonio, and in other parts of Texas; Wright, | 
No. 1535. | 
STACHYS PALUSTRIS, Linn.?; Benth. 1. c. Near San Diego, California, May; Thurber. | 
TRIcHOsTEMA LANATUM, Benth. Lab. p. 659. (Тав. XL.) Solidad, above San Diego, Cali- 
fornia, June—July ; Parry; also found near San Antonio, in the same State, by Dr. Andrews. 
Pubescence purplish and velvety. Stamens exserted two inches. Plant fragrant. 
TRICHOSTEMA DICHOTOMUM, Linn. Benth. 1. с. Western Texas. (No. 1541, Wright.) 
TTETRACLEA COULTERI, Gray in Sill. Jour. (2 ser.) 16, р. 97. (Tas. XLI.) Rocky hills on the 
Rio Grande, from Eagle Pass upward to El Paso; July—October. Sierra del Pajarito, June, 
Schott, and San Bernardino, Sonora, April; Capt. E. K. Smith. Mr. Bentham having in a 
recent letter communicated to me his opinion that Tetraclea is a true Labiate plant, and hardly 
distinct from Trichostema, Dr. Gray makes the following remarks: ** Tetraclea Coulteri is most 
nearly allied to Trichostema, § Orthopodium, as Mr. Bentham suggests. But it differs in the 
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