STANDEE Y TREES AND SHRUBS OF MEXICO. 723 



The numerous specimens examined are remarkably uniform in tlieir char- 

 acters, the only exception being a few which are referable to C. azureus parvi- 

 foUus S. Wats. This form is distinguished by its relatively small leaves and 

 reduced inflorescence. Although raised to specific rank by Rose, there appears 

 to be no character by which it can be separated definitely from C. coeruleus. 



10. Ceanothus huichagorare Loesener, Repert. Sp. Nov. Fedde 8: 298. 1910. 

 Chihuahua, Coahuila, Sonora, and Jalisco ; type from Baquiriachic, Chi- 

 huahua. 



Low shrub with slender spinose branches; leaves elliptic or oval, 1 to 1.8 

 cm. long, obtuse or rounded at base and apex, green and glabrate above, 

 appressed-pilose beneath along the nerves. 



The specimens to be placed here have usually been determined as C. huxi- 

 folius. " Huichagorare " is the Tarahumare name of the plant. 



11. Ceanothus pueblensis Standi., sp. nov. 



Type from Esperanza, Puebla {Purpus 5821; U. S. Nat. Herb. no. 464452). 



Shrub with short stiff spinose branchlets ; leaves short-petiolate, 7 to 10 mm. 

 long, 6 to 8 mm. wide, broadly rounded at each end, 3-nerved, green and glabrate 

 above, densely whitish-sericeous beneath, glandular-serrulate; flowers white, 

 the pedicels glabrous. 



12. Ceanothus durangoinus Loesener, Repert. Sp. Nov. Fedde 8: 297. 1910. 

 Durango ; type from Hacienda Santa Catalina, Sierra de Gamon, altitude 



2,200 meters. 



Low, densely branched shrub with gray or brownish branches ; leaves short- 

 petiolate, 0.8 to 1.7 cm. long, green above, gray beneath. 



13. Ceanothus ferox Standi., sp. nov. 



Type from mountains near Miquihuana, Tamaulipas (Nelson 4479; U. S. 

 Nat. Herb. no. 332667). 



Branchlets slender, brownish, spinose, puberulent ; leaves short-petiolate, 

 oval-elliptic to suborbicular, 5 to 10 mm. long and nearly as wide, rounded at 

 each end, 3-nerved, glandular-serrulate, green and glabrous above, paler green 

 beneath and appressed-pilose along the nerves; capsule 5 mm. broad, densely 

 covered with irregular ridges and tubercles. 



14. CeaiiOthus depressus Benth. PI. Hartw. 8. 1839. 

 San Luis Potosf and Zacatecas ; type from Zacatecas. 



Shrub with stout spinose branches ; leaves short-petiolate, oblong-elliptic or 

 elliptic, 1 to 2 cm. long, obtuse or rounded at each end. 



Specimens from San Luis Potosf are referred here upon the authority of 

 Watson, but the writer does not feel certain that they are correctly determined. 



15. Ceanothus endlichii Loesener, Repert. Sp. Nov. Fedde 8: 298. 1910. 

 Chihuahua and Sonora ; type from Chihuahua, in the Sierra Madre between 



Basagote and Cerracahue, altitude 1,600 meters. 



Low spiny shrub ; leaves short-petiolate, oblong-elliptic to rounded-ovate, 

 1 to 3 cm. long, grayish, rounded at each end. 



Some of the specimens have been determined previously as C. fendlcri venosus 

 Trel., and a Sonoran specimen has been reported as C. buxifolius. 



16. Ceanothus buxifolius Willd. ; Roem. & Schult. Syst. Veg. 5: 300. 1819. 

 Chihuahua, Durango, and Hidalgo ; type from Real del Monte, Hidalgo. 

 Low spiny shrub ; leaves elliptic-obovate to broadly elliptic, 8 to 16 mm. 



long, rounded to acutish at base, rounded at apex, petiolate. 



It is possible that the material at hand represents two species, but the forms 

 seem identical except in leaf shape. 



