220 BOTANY. 



ing the special peduncle ; bracts ovate-cordate, 2-5-flowered (some of 

 them aborting); flowers 8-10" long, light purple, lower lip 3-toothed, upper 

 lip ovate. Very variable in foliage and inflorescence. — Cienega, Southern 

 Arizona. Besides this form, I have another resembling it in all respects, 

 save that the inflorescence is more simple; two or three peduncles, 1-1 2' 

 long, rising from the axils at a node, and each terminated by a single pair of 

 the usual ovate-cordate bracts. This difference is constant in my specimen 

 (571), and might entitle it to a specific rank were it not for the variability 

 in just this respect in D. resupinata. Also from Cienega, Arizona. 



Tetramerium* hispidum, Nees (T. nervosum, Nees, "vax.hispidumfoliis 

 ovato-oblongis obtusiusculis vel actitis (non acuminatis)", Torr. Bot. Mex. Bound, 

 p. 125). — Bracts conspicuously ciliate, oblong; flower yellowish-white (with 

 the anthers visible through a lobe of the lower lip as a brown spot), 5-7" 

 long. — In the Sanoita Valley, Arizona (686), near (probably) where the 

 specimens described in Bot. Mex. Bound. I. c. were obtained. 



VERBENACE.E. 



Lippia Wrightii, Gray (Torr. in Bot. Mex. Bound, p. 126). (Aloysia 

 scorodonoicles, H. B. K. Nov. Gen. et Sp. 2, p. 260, is a different plant.) — Shrub, 

 2-4 feet high, much branched; leaves oval, 3-8" long, thickish, deeply crenate, 

 rugose above and white tomentose-pubescent below, abruptly tapering to a 

 short petiole ; hairy spikes 1-1 \' long, paniculate ; flowers white, 1-2" long, 

 tubular, with a spreading, subregular border ; stamens subequal, short. 

 Calyx with long, spreading, white hairs. The mature fruit readily separates 

 into two nutlets. — Mount Turnbull (170 a, Loew), and elsewhere in Arizona. 



Lippia nodiflora, Michx. — Herbaceous or somewhat woody ; stem 

 creeping, rooting at the joints ; peduncles long, slender ; entire plant finely 

 pubescent ; leaves oblanceolate or cuneate, serrate toward the apex ; white 



* Tetramemum, Nees. — Herbaceous bracts narrow, more or less connate in pairs, including single 

 Mowers with or without rudiments of others. Calyx short, 5-cleft ; lobes linear, delicate. Tube of co- 

 rolla slender, cylindrical ; limb 2-lipped, the hinder lip interior, obovate or oblong, erect, entire, con- 

 cave, the lower lip 3-parted, with the oblong lobes flat, spreading, the middle one outside. Stamens 2, 

 inserted in the throat and sub-equalling the corolla ; anthers 2-celled, the equal, pointless, parallel cells 

 separated by a broadish connective; staminodia 0. Disk rather thick. Style filiform, the stigmatose 

 Bubelavate apex with 2 very short lobes ; 2 ovules in either cell. Capsule ovate-oblong, tapering into a 

 solid stipe at base ; placenta during dehiscence torn loose from the valves. Seeds 4, or fewer by abortion, 

 plauo-compressed, sub-orbicular.— Pubescent herbs, ofteu shrubby at base. Leaves entire. Flowers 

 rather small, pallid.— Bbnth. & Hook. 



