536 PROCEEDINGS OF THE AMERICAN ACADEMY. 



exceeding the lobes ; upper lip oblong-ovate, entire, blunt, lower with 

 two acuminate narrower lobes : corolla-tube glabrous, twice exceeding 

 the calyx ; galea slightly pilose at tip, shorter than the lip. — San Luis 

 PoTOSi, in the mountains near Morales, 1876 {Schaffner, no. 6G7), 

 called " mirto grande." Habitally this plant suggests aS". fidgens, var. 

 Boucheana, Benth., but it is readily distinguished by its less pubescent 

 leaves, shorter calyx and slightly pilose galea. 



O O Pubescent herb with ovate obtuse leaves canescent beneath. 



144. S. OBTUSA, Mart. & Gal. 1. c. 72 ; Benth. in J)C. 1. c. 334; 

 Van Houtte, Fl. des Serres, xiv. t. 1412 (?) ; Hemsl. 1. c. ii. 562. — 

 Described from Oaxaca. Various j^lants are cultivated under this 

 name, but the figure above cited perhaps best represents the species. 



h. Calyx glabrous or barely puberulent at base. 



145. S. oresbia. Small shrub, 2 to 3 dm. high : branches purplish, 

 puberulent in lines or ghibrate : branchlets short, leafy mostly at the 

 tip : leaves firm, ovate, acute at each end, appressed-serrate, glabrate, 

 1 to 2.5 cm. long: racemes 1 dm. or less in length; verticels 2-4- 

 flowered: bracts firm, ovate, acuminate, 1 cm. or less long, persistent: 

 pedicels 3 to 7 mm. long, puberulent: calyx purple-tinged, in anthesis 

 1 to 1.2 cm. long, puberulent within ; tlie tube thrice exceeding the 

 broad ovate mucronate-acuminate lobes: corolla 2 cm. long; the gla- 

 brous strongly ventricose tube one half longer than the calyx ; the pilose 

 galea hardly equalling the lip : style glabrous. — San Luis Potosi, 

 in the mountains, San Rafael, 1876 {Schaffner, no. 666) ; without lo- 

 cality, alt. 1,850 to 2,460 m., 1878 {Parry & Palmer, no. 740). 



= = Pubescence of branches and leaves stellate. 



146. S. oaxacana. Very branching shrub : the bark pale gray, the 

 young branches and branchlets white with stellate tomentum : leaves 

 ovate, truncate or cordate at base, 1 cm. or less in length, i)ale green and 

 strongly rugose above, white-tomentose beneath, crenate, one-half longer 

 than the tomentose petioles : racemes 6 cm. or less long ; the verticels 

 mostly 2-flowered, 1 to 1.5 cm. apart : bracts ovate-lanceolate, caducous : 

 pedicels 3 to 6 mm. long, glandular-pilose : calyx open-campanulate, 

 glandular-pilose, in anthesis 8 to 10 mm., in fruit becoming 1.3 to 

 1.5 cm. long : the upper lip broad-ovate, mucronate, somewhat bidentate, 

 the lower lip with 2 ovate-lanceolate acuminate lobes : corolla somewhat 

 glandular-pilose ; the strongly ventricose tube twice exceeding the calyx ; 

 the galea and lip subequal : style bearded. — Oaxaca, La Hoya Caiion, 



