1Y4 ROSACEA. Cohogyne. 



8. COLEOGYNE, Ton. 

 Calyx persistent, 4-iiarted ; lobes large, ovate, imbricated, Avith a nierabranaceous 

 margin, colored witliin. Petals none. Stamens numerous, inserted upon the base 

 of a tubular torus which includes the ovary. Carpels solitary (rarely 2), glabrous, 

 oblong : style lateral, very villous at base, twisted, exserted, persistent : stigma de- 

 current : ovule solitary, ventrally attached opposite the base of the style. Fruit a 

 coriaceous akene, glabrous, included. Seed with a rather spongy testa, without 

 albumen : radicle superior. — A diffusely branched somewhat spinescent shrub ; 

 leaves opposite, small, entire, coriaceous ; stipules minute ; flowers solitary, termi- 

 nal on the short branchlets, subtended by 1 or 2 pairs of 3-lobed bracts, yellow, 

 showy. A remarkaljle genus, of a single species. 



1. S. ramosissima, Torr. Much branched, 3 to 6 feet high, the short rigid 

 branches opposite and spinescent ; bark gray : leaves approximate upon the branch- 

 lets, linear-oblanceolate, 2 to 4 lines long, thick, usually 2 - 4-sulcate on the lower 

 side, puberulent with appressed hairs attached by the middle ; stipules short, trian- 

 gular : flowers half an inch broad : calyx-lobes often ciliate-toothed : tube of the 

 torus membranaceous, dilated below and narrowed to the shortly 5-toothed apex, as 

 long as the calyx and very slender fllaments, densely white-villous within : akene 

 somewhat compressed, oblong-ovate, the obtuse apex incurved : seed suspended 

 from near the summit and fllling the akene. — PI. Frem. 8, t. 4 ; Parry, Am. 

 I^aturalist, ix. 270. 



Aljout tlie head-waters of the Mohave {Fremont) and eastward in Southern Nevada and Arizona 

 to Southern Colorado. 



9. CERCOCARPUS, HBK. MorxTAix Maiiogaxt. 



Calyx narrowly tubular, the campanulate 5-lobed limb deciduous ; lobes slightly 

 imbricated. Petals none. Stamens 15 to 25, in 2 or 3 rows on the limb of the 

 calyx. Carpels solitary (rarely 2), narrow, terete : style terminal : stigma terminal : 

 ovule solitary, ascending. Fruit a coriaceous linear terete villous akene, included in 

 the enlarged calyx-tube, caudate with the elongated exserted plumose twisted style. 

 Seed linear, with membranous testa : radicle inferior. — Shrubs or -trees ; leaves 

 alternate, simple, evergreen ; stipules very small ; floAvers small, axillary or terminal, 

 solitary or somewhat fascicled. 



A genus of 4 or 5 species, chiefly of the interior of the continent, one being Mexican. 



1. C. ledifolius, Xutt. A shrub or small tree, usually 6 to 15 feet high : leaves 

 narrowly lanceolate with the margins more or less revolute, thick-coriaceous and 

 somewhat resinous, entire, more or less tomentose, but usually glabrous above, -|- to 

 1| inches long, acute, narrowed at base to a short petiole; midnerve prominent: 

 flowers sessile, tomentose : limb of the calyx 2 lines long, deeply toothed ; tube be- 

 coming 3 to 5 lines long : tail of the akene at length 2 or 3 inches long. — Torr. & 

 Gray,>h i. 427; Hook. Ic. PL t. 324; Nutt. Sylva, ii. 28, t. 51 ; Watson, Pot. 

 King Exp. 83. 



Olanche ]\Its. (EotJirock) at 9,400 feet altitude, and on the eastern slope of the Sierra Nevada 

 from Mono Pass at 9,000 feet altitude {Bolandcr) to Oregon, and eastward in tlie mountains to 

 the Wahsatch. It is populariy known as Mountain Mahogany, having a liard and heavy dark- 

 colored wood, susceptible of a fine polish. It sometimes becomes a bamlsome tree, 40 or 50 feet 

 high, hut is usually low, with a compact head. 



2. C. parvifolius, Xutt. A shrub, usually 2 to 10 feet high, branching from a 

 thick base, sometimes 15 to 20 feet high : leaves cuneate-obovate, less coriaceous. 



