372 EEICACE^. 



obscure constriction just below the middle; calyx reddish, only half 

 the diameter of the corolla, somewhat impressed as it were within the 

 truncate or subcordate base of the latter and thus partly concealed; 

 ovary glabrous; nutlets broader than high, usually two or more 

 coherent, rarely all united into a single irregular stone. 



Known only from the Mayacamas Range: common on the volcanic 

 rock summit of Mt. St. Helena; exclusively occupying a large part 

 of the denuded La Jota Plateau near La Jota Falls, Howell Mt. 

 Feb. -May. Very trim and like a well-kept shrub, recognizable 

 even by its bright green leaves which are commonly erect, while 

 those of A. Manzanita are far less so. 



6. A. glauca Lindl. Shrubby or almost arborescent, 9 to 25 ft. 

 high, with a trunk often 1 ft. in diameter; foliage glabrous and 

 glaucous; leaves elliptical to broadly ovate or oblong, entire, acute or 

 obtuse at apex, obtuse, truncate or even subcordate at base, 1 J to 2 in. 

 long; petioles 3 to 4 lines long; panicle broader than high, frequently 

 very compact; pedicels glandular-pubescent; flowers white, rather 

 large; fruit usually viscid, pulp scanty; nutlets completely con- 

 solidated into a solid smooth stone. 



Common in the Mt. Diablo range and southward: Los Gatos, 

 Bi-<mdegee, Parry. Apparently on Caux's Knob west of St. Helena. 

 The leaves of the sterile shoots are sometimes sharply serrate all 

 around. 



6. ARBUTUS L. 



Our species a tree or large shrub. Leaves evergreen, coriaceous 

 and glossy. Bracts and bractlets scaly. Flowers white. Calyx 

 small, 5-parted, free from the ovary. Corolla globular or ovate. 

 Stamens twice as many as the corolla-lobes, included; anthers with 

 a pair of reflexed awns on the back, each cell opening at the apex 

 anteriorly by a pore. Ovary on a hypogynous disk, 5 or rarely 

 4-celled; ovules crowded on a fleshy placenta which projects from the 

 inner angle of each cell. Fruit a many-seeded berry with granular 

 surface. (Classical name of the Arbute tree, under which, says 

 Horace, idle men delight to lie.) 



1. A. Menziesii Hook. MadkoSa. Commonly 15 to 25 ft. high, 

 the trunk 9 to 18 in. in diameter, with a deep red bark; leaves gla- 

 brous, elliptic or ovatish, green above, glaucous beneath, 2 to 5 in. 

 long, on petioles ^ in. long; flowers in an ample terminal panicle of 

 dense racemes; berries fleshy, but rather dry, vermilion or poppy-red, 

 or orange-color when not fully ripe, somewhat depressed-globose, 4 to 

 6 lines in diameter. 



A handsome tree, Bret Harte's " Eobin Hood of the Western 

 Wood," well known in the Sierra Foothills and very common in the 

 Coast Ranges, especially northward, where fine specimens 60 ft. high 

 are found. It is rare in the inner North Coast Ranges, only few 

 isolated individuals being known in the mountains of western Solano 

 Co. Large trees are seldom as symmetrical as small ones and usually 

 have the trunk much enlarged at the ground. The bark, which is of 



