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dpi Pme vent 
BOTANY. 83 
Prunus GRACILIS, Engelm. d Gray, Pl. Lindh. 1, p. 35. Prairies, Gains' creek, Indian 
Territory; August. In fruit. Cultivated under the name of Prairie Cherry. This appears 
to belong to the Microcerasus group. 
CERASUS VIRGINIANA, DC. Banks of the Pecos, and in cañons of the Llano Estacado ; Sep- 
tember. Sandia mountains ; October. In fruit. 
CERASUS DEMISSA, Nutt. in Torr. d Gray, Fl. 1, p. 411. Deep ravines, Sonora, California, 
May 9; and Duffield's Ranch, Sierra Nevada ; May 12. 
CERASUS EMARGINATA, Dougl. in Hook. Fl. Bor.- Amer. 1, p. 169; Torr. de Gray, Fl. 1, p. 410. 
Hill sides, near Downieville, California; May 21. A small shrub, with numerous slender 
branches. Flowers in short corymbose racemes. Leaves $ of an inch to an inch and a half 
long, entire at the summit. Teeth of the calyx obtuse and reflexed. 
CERASUS MINUTIFLORA, Engelm. in Gray, Plant. Lindh. 2, p. 185, sub Pruno; Gray, Pl. 
Wright. 2, p. 68. Williams” fork of the Colorado, Western New Mexico. Fruit only. 
CERASUS ILICIFOLIA, Nutt. in Torr. & Gray, Fl. 1, p.411; € Sylv. 2, p. 16, t. 47; Hook. 
& Arn. Bot. Beechey, p. 340, t. 83. Topographical Hill, near Williams’ fork of the Colorado. 
With leaves only. 
NUTTALLIA CERASIFORMIS, Torr. & Gray, in Hook. & Arn. Bot. Beechey, p. 336, t. 82; & FI. 
1, p. 413. Mountains, near Oakland; April 5, (in flower and young fruit,) and hill-sides, 
Napa valley, California ; April 27, (with mature fruit.) 
SPIRAEA OPULIFOLIA, Linn. Sp. 1, p. 489; Torr. € Gray, Fl. 1, p. 413. Arroyos, in the 
Sandia mountains, New Mexico, October. Banks of streams and hill-sides, Napa valley, ete., 
California ; April 27. 
SPIRAEA ARLEFOLIA, Smith in Rees, Cycl.; Torr. € Gray, Fl. 1, p. 416. Banks of streams, 
Sonoma, California; May 3. 
SPIRAEA CESPITOSA, Nutt. in Torr. € Gray, Fl. 1, p. 418; Gray, Pl. Fendl., p. 40. Rocky 
places, Pass of Mt. Hope, Western New Mexico; January 23. "The wood of the stem has no 
annual rings, even when several years old, and the medullary rays are as wide as the woody 
wedges. : 
PIRAA MILLEFOLIUM (sp. nov.): lanoso-tomentosa; foliis circumscriptione oblongo-lanceolatis 
pinnatis multijugis, pinnis pinnatisectis partitisve oblongo-linearibus cum foliolis minutissimis 
oblongis confertissimis ; floribus racemoso-paniculatis. (Tab. V.) Low hills and valleys, near 
Williams’ mountain; January 5. A shrub, apparently 1-2 feet high. Leaves crowded on 
short branches or spurs, scarcely an inch long; pinns oblong-linear, in 20 or more pairs; the 
upper ones sometimes confluent ; leaflets very numerous, about one-fourth of a line long, densely 
tomentose, and of a somewhat fleshy texture. Stipules linear, minute, deciduous. Racemes in 
a long and rather loose terminal panicle. Calyx turbinate; the teeth acute, erect, rather 
longer than the tube. Petals orbicular-obovate, longer than the calyx. Stamens about 70; 
the filaments distinct at the base, inserted into the margin of a disk, which is wholly adnate to 
the tube of the calyx. Ovaries 5, distinct, at first woolly ; styles filiform; stigmas somewhat 
capitate. Ovules 8-10, pendulous from the upper part of the ovary, narrowly oblong. Mature 
carpels nearly glabrous, erect, 2-valved to the base. All the mature seeds had fallen, but the 
immature ones were somewhat attenuated at each end. Although so very remarkable, this 
appears to bea genuine Spiræa, and to resemble more the Euspirea than any other of the 
admitted sections of the genus. The leaflets are almost as small and erowded as in Chamabatia. 
The specimens collected by Dr. Bigelow seem to have the persistent inflorescence and fruit of 
the preceding autumn, and the young leaves of the new year. Many of the flowers exhibited 
the withered petals, and there were a few imperfect undeveloped buds. 
CERCOCARPUS PARVIFOLIUS, Nutt. in Torr. € Gray, Fl. 1, p. 427; Gray, Pl. Fendl., p. 41; Hook. 
le. Pl. t. 323. Hills on the Llano Estacado; also sandy hills, Cahon Pass and Cocomungo, 
April 16-17; hills and ravines, Sonora, California; May 9. A shrub about 10 feet high. C. 
pri , H 
betulaefolius seems to pass into this species. 
