274 ERICACEAE. 



2. U. pungens (H. B. K.) Abrams. Shrubby or arborescent, 

 2-8 m. high; bark mahogany-red, exfoHating, twigs and petioles 

 minutely tomentose-pubescent; leaves dull green, commonly vertical 

 by a twist in the short petiole, rigid, ovate-oblong, glabrous on both 

 surfaces, 2.5-5 cm, long; petioles 6-10 cm, long; bracts less than 4 

 mm. long; pedicels smooth, corolla pinkish; ovary smooth; fruit 

 irregularly depressed-globose, 8-12 mm, broad, reddish brown; 

 nutlets irregularly separable, rough-carinate. 



Occasional in the San Gabriel Mountains, More common in 

 the San Bernardino Range. In both confined mostly to the upper 

 portions of the chaparral belt, 



3. U. patula (Greene) Abrams, Diffusely branched shrub, 1-1.5 

 m. high; young twigs rusty puberulent or nearly smooth; leaves 

 smooth, bright green, ovate to broadly cordate, 2-5 cm. long, 

 entire, obtuse; bracts lanceolate; pedicels smooth; fruit smooth, 

 depressed-globose, about 6 mm. in diameter; nutlets united into a 

 deeply lobed stone. 



Occasional on dry ridges in the open pine woods of the San 

 Antonio and San Bernardino Mountains, 5000-8000 feet altitude. 



4. U. glauca (Lindl.) Abrams. Shrubby, erect, 3-6 m. high, 

 smooth throughout; leaves glaucous, ovate, entire or denticulate; 

 bracts foliaceous, conspicuous; pedicels stout, glandular-pubescent; 

 ovary viscid-glandular, 6-8-celled; fruit dark red, very viscid; stone 

 with longitudinal ridges, sharply apiculate. 



Occasional in the San Gabriel Mountains. More common in 

 the San Antonio and San Bernardino Ranges. 



5. U. tomentosa (Pursh) Abrams. Shrubby, erect, 1.5-3 m. 

 high, twigs, foliage and pedicels minutely tomentose when young, 

 the twigs often also hispid with scattered hairs; leaves glaucescent, 

 paler and tomentose beneath, ovate to elliptic, entire or sometimes 

 denticulate; bracts conspicuous, foliaceous, usually exceeding the 

 short pubescent or somewhat hispid pedicels; ovary densely hirsute, 

 7-10-celled; fruit hirsute, minutely roughened; nutlets all separate 

 or some united in pairs. 



Common in all our mountains in the upper chaparral belt. The 

 common form in the San Gabriel Mountains is usually more or less 

 glandular, but all gradations occur, so that it does not seem possible 

 to separate them. 



6. U. drupacea (Parry) Abrams. An erect, branching shrub, 

 1.5-2 m. high; twigs and petioles hispid and glandular-pubescent; 

 leaves ovate to obovate, mucronate, rough, with ciliate margins, 

 on petioles 4-8 mm. long; inflorescence in dense divaricate panicles; 

 bracts linear-lanceolate; pedicels slender, 10-15 mm. long, glandular- 

 pubescent; calyx-lobes lanceolate, densely glandular-villous, ovary 

 glandular-hispid; nutlets consolidated into a rough carinate stone. 



Occasional in the pine belt of the San Bernardino, San Jacinto 

 and Cuyamaca Mountains. 



Xylococcus bicolor Nutt. Shrub, 1-2 m. high; leaves ovate or 

 oblong, 4-6 cm. long, margins entire, strongly revolute, glabrous 

 above, white-tomentose beneath, short-petiolate; inflorescence in 



