S34 PROCEEDINGS OF THE AMERICAN ACADEMY 



2. C. OVATUS, Bigel. Neai-ly glabrous or somewhat pubescent; 

 leaves narrowly oval or elliptic-lanceolate, 1-2 inches long ; peduncles 

 usually short; otherwise like the last, into which it seems to pass. — 

 Range the same. 



3. C. SANGUINEUS, Pursh. (C. Oreganus, Nutt.) Becoming gla- 

 brous or nearly so ; leaves thin, ovate, 1-4 inches long, on slender peti- 

 oles 6-15 lines long; peduncles very short; older branches reddish. — 

 From North-western Montana to Washington Territory. The speci- 

 mens of Nuttall referred here in Torrey and Gray's Flora belong to 

 the preceding species. 



4. C. VELUTiNUS, Dougl. Stout, usually glabrous ; leaves coria- 

 ceous, broadly ovate or elliptical, 1.^3 inches long, resinous and sinn- 

 ing above, sometimes velvety beneath, glandular-serrulate ; petioles 

 stout, 6 lines long ; peduncles usually short. — Abundant in the moun- 

 tains from Colorado to the Columbia and Northern California. 



5. C. INTEGERRIMUS, Ilook. & Arn. Glabrous or soon becominnf 

 so, rarely pubescent; branches terete, usually warty ; leaves thin, bright 

 green, ovate to ovate-oblong, 1-3 inches long, entire or very rarely 

 slightly glandular-serrulate, on slender petioles 2-G lines long ; thyrse 

 often large and open, terminating the slender branches, or axillary and 

 rather shortly peduncled, mostly white-flowered. — Frequent in the 

 mountains from Central California to the Columbia Iliver. This will 

 include C. Californicus and Nevadensis of Kellogg. 



Var. ? PAUVIFLORUS. Of very slender habit, wholly glabrous ; 

 leaves much smaller, about half an inch long, short-petioled ; flowers 

 light blue, in rather short simple racemes. — In the Sierra Nevada 

 from the Yosemite Valley northward. Possibly distinct, but inter- 

 mediate forms occur. It is 51 Bridges, 1628 Brewer, 3880 and 4870 

 Bolander, 68 and 68 a Torrey, and was also collected by Bigelow and 

 by Dr. Gray. 



h. Tall shrubs or small trees, 6-15 feet high ; flowers bright blue; 

 leaves oblong to oblong-ovate, rather thick. 



6. C. TnYusiFLORUS, Esch. Sui)glabrous ; branches strongly angled ; 

 leaves usually smooth and shining above, canescent beneath, glandular- 

 serrulate, 1-1^ inches long; flowers in dense subcorapound racemes, 

 terminating the usually elongated and somewhat leafy peduncles. — 

 In the Coast Range, California, from Monterey to Humboldt County, 

 and |)opularly known as the " California Lilac." 



Var.? MACROTHYRsus, Torrey in Bot. Wilkes' Explor. Ex|)ed. 263. 

 This is described as having terete branches ; leaves 1-2 1- inches long, 



