520 



FAGACEAE 



9. Quercus macdonaldi Greene. 

 MacDonald's Oak. Fig. 1260. 



Oucrciis macdonaldi Greene, W. Am. Oaks 

 25. 1889. 



A small tree. 8-12 m. high with 

 a trunk 5 dm. in diameter, and a com- 

 pact rounded crown; young twigs 

 densely pubescent ; bark scaly. Leaves 

 deciduous, oblong to obovate, 5-7 cm. 

 long, with 2-4 lobes on a side, these 

 blunt or sharp-pointed and bristle- 

 tipped, narrowied and entire at base, 

 thick and firm, glabrous above, densely 

 pubescent below becoming less so and 

 prominently reticulate-veined ; acorns 

 sessile ; cup deeply hemispherical, its 

 scales strongly tuberculate ; nut ob- 

 long-conical acute 20-35 mm. long. 



Canon slopes. Upper Sonoran Zone; 

 Santa Cruz and Santa Catalina Islands, off 

 the coast of southern California. Type lo- 

 cality: Santa Cruz Island. 



10. Quercus dumosa Nutt. California Scrub Oak. Fig. 1261. 



207. pi. 51. 



Quercus dumo.<ia Nutt. Sylva 1: 7. 1842. 

 Quercus acutidcus Torr. Hot. Mex. Bound. 

 1859. 



A shrub 1-3 m. high, with stout short stiff 

 branches ; young twigs rusty-tomentose ; bark scaly, 

 light grayish brown. Leaves evergreen but falling 

 as the new leaves appear in the spring, oblong to 

 roundish, 15-25 mm. long, entire or usually irregu- 

 larly spinose-serrate, or sinuate-lobed, coriaceous, 

 plane or undulate, dark green and shining above, 

 pale beneath and pubescent ; cup deep cup-shaped, 

 enclosing about one-half the nut, light brown and 

 pubescent within, its scales ovate, united and tuber- 

 culate toward the base, more or less rusty- 

 tomentose ; nut oval, broad at base, rounded or 

 acute at apex, 1-3 cm. long. 



Chaparral covered foothills and mesas. Upper Sonoran 

 Zone; northern Coast Ranges of California and the west- 

 ern slope of the centra! Sierra Nevada, southward to 

 northern Lower California. Type locality: Santa Bar- 

 bara. A very common species in the southern part of 

 California and remarkably variable in foliage and fruit. 

 Apparent hybrids between it and Quercus cngclmanni 

 sometimes occur. , ,,- . " 



Quercus dumosa turbinella (Greene) Jepson, Fl. Calif. 1 : .^56. 1909. (Quercus turhinclhi. Greene, U . Am. 

 Oaks 37. 1889.) Leaves oblong or elliptic, bright green above, pale beneath; cup turbinate, its scales thni 

 not tuberculate; nut slender acute, about 25 mm. long. Mountain slopes. Upper Sonoran Zone; San Jacinto 

 Mountains, southern California, to northern Lower California. Type locality: mountains of Lower Cali- 

 fornia, 20 to 30 miles below the international boundary. 



11. Quercus durata Jepson. 

 Leather Oak. Fig. 1262. 



Quercus dumosa bullata Engelm. Bot. Calif. 2: 96. 



1880. 

 Quercus durata Jepson, Fl. Calif. 1: 356. 1909. 



A shrub 1-3 m. high, with rigid branches 

 and branchlets ; young twigs rusty-tomen- 

 tose ; bark scaly, light grayish brown. 

 Leaves evergreen, persisting well after the 

 new leaves are formed, 15-25 mm. long, 

 oval, thick and coriaceous, spinose dentate, 

 revolute, dark dull green and stellate-pu- 

 bescent above, paler and tomentose below ; 

 cup bowl-shaped, enclosing about one-half 

 the nut. its scales thick and tuberculate, 

 grayish tomentose. 



Chaparral covered hills and mountains, Upper 

 Sonoran Zone; Coast Ranges from Lake to San 

 Luis Obispo Counties, California. Type locality: 

 .San Carlos Range, California. 



