Plates XVIII and XIX. 



QUERCUS DUMOSA, Nuttall. 



Bibliography. 



QuERCUS DUMOSA, Nuttall, N. Am. Sylv. i, 7 (1842). 



QuERCUS BERBERiDiFOLiA, Liebm., Vidensk. Forhandl. (1854) 172, in part. 

 QuERCUS ACUTiDENS, ToiT., Bot. Mex. Bound. 207 t. 51 (1858). 

 QuERCUS DUMOSA, Torr., loc. cit. 



, Engelm., Trans. St. Louis Acad, iii, 382 (1876); Bot. Cal. ii, 96 (1880). 



. , Greene, in Bull. Calif. Acad, ii, 412' (1887). 



Description. A straggling evergreen bush from three to eight feet high, the twigs 

 slender, woolly when young: leaves about an inch long, of leathery texture, oblong, 

 obtuse, sinuate and spinose-toothed and more or less revolute, pubescent beneath, or on 

 both sides : fructification annual : acorns sessile ; cup hemispherical, strongly tuberculate ; 

 acorn oval or oblong, scarcely an inch long. 



Habitat. Dry hills of the Coast Range of California, from San Diego to Lake 

 County; not known to occur upon even the foot-hills of the Sierra Nevada, at least in the 

 typical form. 



Remarks. A mere scrub oak, useless except as forming a bushy covering to hill-sides, 

 and as furnishing a copious supply of small acorns to wild fowl and rodents. 



As a species, Q. duniosa must be admitted as rather variable, yet less so than Dr. 

 Engelmann thought; for the bush of the Lower California Peninsula, and of the neigh- 

 boring highlands of San Diego County, is of a clearly distinct species which is named and 

 defined on a subsequent page. 



The type of the species, that is to say, the shrub known imperfectly by Nuttall, and 

 partiall}' described in the Sylva, belongs to the hills behind Santa Barbara. 



Dr. Engelmann's variety bullata differs from the type in the more compact mode of 

 growth, as well as in having a foliage which is strongly convex above, and permanently 

 tomentose- pubescent on both surfaces: and this variety has a more northerly range, 

 occurring plentifully upon low hills in Lake County. 



The shrub of the Island of Santa Cruz which I have perhaps too confidently, at a for- 



