FLOWERING PLANTS AND FERNS OF ARIZONA 841 



7. TETRAMERIUM 



Plant herbaceous or suffrutescent; stems several, erect or decum- 

 bent, leafy, the old bark exfoliating; foliage leaves and bracts bright 

 green, conspicuously ciliate with long stiff hairs and usually sparsely 

 hirsute on the veins, often also puberulent; spikes 4-rowed; corolla 

 slightly bilabiate, the tube longer than the limb, the upper lip entire, 

 the lower lip 3-parted. 



1. Tetramerium hispidum Xees in DC, Prodr. 11: 468. 1847. 



Santa Cruz and Pima Counties. 3.000 to 5.000 feet, among rocks 

 and shrubs, usually in partial shade. April to October. Southern 

 Arizona and Mexico. 



This plant is reported to be very palatable to livestock. 



8. DICLIPTERA 



Plants herbaceous; stems erect or decumbent, branched, leafy; 

 flowers each subtended by a pair of valvelike bractlets, solitary in 

 the axils or in few-flowered cymes, the whole inflorescence a loose 

 leafy panicle; corolla rose purple, deeply bilabiate, the lips entire to 

 shallowly lobed; stamens 2. 



Key to the species 



1. Bractlets cordate, subcordate, or slightly cuneate at base, separate or very 

 nearly so; cymes mostly on peduncles surpassing the leaves. 



1. D. REsTPIXATA. 



1. 1 ractlets truncate and abruptly cuneate at base, united the length of the wedge- 

 ^ha] ed | ortion; cymes shorter than the leaves, sessile or subsessile. 



2. D. PSEI"DOVERTICILLARIS. 



1. Dicliptera resupinata Juss., Paris Mus. Hist. Xat. Ann. 9: 268. 



1807. 



Dicliptera torn yi A. Gray, Amer. Acad. Arts and Sci. Proc. 



20: 309. 1885. 

 Diapedium torreyi VToot. and Standi., Contrib. U. S. Xatl. 



Herbarium 19: 598. 1915. 



Pima County, 3.000 to 4.000 feet, rocky slopes and canyons, April 

 to September. Southwestern New Mexico, southern Arizona, and 

 Mexico. 



2. Dicliptera pseudoverticillaris A. Grav, Amer. Acad. Arts and Sci. 



Proc. 20: 308. 1885. 



Pima County, south of Tucson (Thornber 5351, 5512) and in the 

 Baboquivari Mountains (Loomis and King 3255). Southern Arizona 

 and northwestern Mexico. 



The Arizona specimens referred to this species, as compared with 

 the type from Altar Valley, Sonora (Pringle in 1884), are less extreme 

 in their characters, approaching D. resupinata. 



9. SIPHOXOGLOSSA 



Plant herbaceous or nearly so; stems clustered, usually decumbent, 

 commonly puberulent: leaves short-petioled, the blades lanceolate: 

 flowers clustered in the axils: corolla white, the tube very long and 

 -lender, the limb short, the lower lip spreading, deeply 3-lobed. 



