414 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
KEY TO THE SPECIES. 
9 
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 usually not 
exceeding the leaves. 
Branches spinescent; leaves sericeous beneath, elliptic to 
lanceolate, acutish............. 2.000.020.0022. 0 eee 2. C. fendleri. 
Branches not spinescent; leaves never sericeous, hirtellous- 
puberulent, mostly obovate, rounded or retuse at the 
CD 9 >, 3. CL greggit. 
1. Ceanothus mogollonicus Greene, Leaflets 1: 67. 1904. 
Tyrer tocauity: Mogollon Creek in the Mogollon Mountains, New Mexico. Type 
collected by Metcalfe (no. 239), 
Rance: Known only from type locality. 
2. Ceanothus 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. Ceanothus greggii A. Gray, Pl. Wright, 2: 28. 1853. 
TYPE LOCALITY: Buena Vista, Mexico. 
Rance: Western Texas to southern Arizona, south into Mexico. 
New Mexico: Bear Mountain; Organ Mountains; Queen; San Andreas Mountains, 
4. RHAMNUS L. Bucxruorn. 
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 4or 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 leaves 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... -- eee eee eee 2. R. ursina. 
Seeds 3; leaves green on both surfaces, sparingly pubescent 
beneath... 2.22.22... 3. R. betulaefolia. 
1. Rhamnus fasciculata Greene, Leaflets 1: 63. 1904. 
TyPE Locatity: 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 Mountains. Moun- 
tains, in the Transition Zone. 
This is doubtfully distinct from R. smithii. 
