414 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 



KEY TO THE SPECIES. 



Leaf blades thin, bright green, nearly or quite glabrous, 25 to 35 



mm. long; inflorescence much exceeding the leaves 1. C. mogollonicus. 



Leaf blades thick, grayish green, densely pubescent, at least 

 beneath, 20 mm. long or less; inflorescence visually not 

 exceeding the leaves. 

 Branches spinescent; leaves sericeous beneath, elliptic to 



lanceolate, acutish 2. C. fendleri. 



Branches not spinescent; leaves never sericeous, hirtellous- 

 puberulent, mostly obovate, rounded or retuse at the 

 apex 3. C. greggii. 



1. Ceanothua mogollonicus Greene, Leaflets 1: 67. 1904. 



Type locality: Mogollon Creek in the Mogollon Mountains, New Mexico. Type 

 collected by Metcalfe (no. 239). 



Range: Known only from type locality. 



2. Ceanothua fendleri A. Gray, Mem. Amer. Acad. n. ser. 4: 29. 1849. 



Type locality: Mountains east of Santa Fe, New Mexico. Type collected by 

 Fendler (no. 105). 



Range: Wyoming and South Dakota to Arizona and New Mexico. 



New Mexico: Santa Fe and Las Vegas mountains; Sandia Mountains; Capitan 

 Mountains; Chama; Tunitcha Mountains; Sawyers Peak; Mogollon Mountains; White 

 Mountains. Open slopes and thickets, in the Transition Zone. 



3. Ceanothua greggii A. Gray, PL Wright. 2: 28. 1853. 

 Type locality: Buena Vista, Mexico. 



Range: Western Texas to southern Arizona, south into Mexico. 



New Mexico: Bear Mountain; Organ Mountains; Queen; San Andreas Mountain?. 



4. RHAMNUS L. Buckthorn. 



Unarmed shrubs over 1 meter high, with rather large alternate leaves; flowers perfect 

 or polygamo-dicecious, in small axillary clusters; sepals 4 or 5; disks lining the hypan- 

 thium; petals 4 or 5, sometimes wanting, clawless, on the margin of the hypanthium; 

 stamens 4 or 5, inserted on the edge of the disk ; ovary 2 to 4-celled ; fruit a 2 to 4-seeded, 

 rather dry berry. 



KEY TO THE SPECIES. 



Flowers fascicled, 2 or 3 in each axil; leaves small, 35 mm. long or 

 less, yellowish beneath; seeds 2. 

 Mature leaA'es obtuse, finely pubescent on the upper surface. . 1. R.fasciculata. 



Mature leaves acutish, glabrous on the upper surface 4. R. smithii. 



Flowers in peduncled cymes, numerous; leaves usually more than 

 35 mm. long, not yellowish beneath; seeds 2 or 3. 

 Seeds 2; leaves pale beneath with a dense tomentulose pubes- 

 cence 2. R. ursina. 



Seeds 3; leaves green on both surfaces, sparingly pubescent 



beneath 3. R. betulaefolia. 



1. Rharnnua faaciculata Greene, Leaflets 1: 63. 1904. 



Type locality: South Fork of Tularosa Creek, 3 miles east of the Mescalero Agency, 

 New Mexico. Type collected by Wooton (no. 203). 



Range: Southern New Mexico. 



New Mexico: White and Sacramento mountains; Guadalupe Mouutains. Moun- 

 tains, in the Transition Zone. 



This is doubtfully distinct from R. smithii. 



