} 



134 



UNITED STATES AND MEXICAN BOUNDARY. 



attached. 



(longer) 



pair, witli 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 Labiatse 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 S. 

 parvula there is a distinct horizontal wing, free from the tubercles, and surrounding the nutlet. 



mak 



Scutell 



bladder-like inappendiculate fructiferous calyx, in which there is scarcely any distinction of 

 upper and lower lip, distinguishes it sufficiently from that genus. 



Physostegia Virginiaxa, Bentli. Lab. p. 504. Dracocepha 

 828. Western Texas ; Wright. 



Bhazonia truncata, Engelm. d Chay, PI. Lindh. 1, p. 47; Benth I. c.jp. 434. Near Austin, 



um 



Sonora, May; Gapt. 



Texas, May; Wright. 



Marrubium vulgare, L.; Benth. in DO. Prodr. 12, p. 453. Santa Cruz, 

 E. K. Smith. Doubtless introduced by the Spaniards. 



Stachys coccineAj Jacq.; Bentli. in DC. Prodr. 12, p. 46*7. Near the San Pedro river and in 

 other parts of Sonora ; also in Chihuahua ; Thurher. 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, (h Schlecht. in Linncea, 5, p. 100 ; Benth. I. c. p. 479. S. umbrosa, 

 Scheele in Linncea, 22,^. 695. Near Santa Antonio, and in other parts of Texas; Wright, 



No. 1535. 



Stachys palustrts, Linn.f; Benth. I. c. Near San Diego^ California, May; Thurher. 



Trichostema lanatum, Bmth. Lab. p. 659. (Tab. 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. I. c. Western Texas. (No. 1541, Wright.) 

 Tetraclea Coulteri, Gray in Sill. Jour. (2 ser.) 16, p. 97. (Tab. XLI.) Kocky 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 

 nearlv allied to Trichostema, § Orthopodium, as Mr. Bentham suggests. But it differs in the 



