Parr 3, 1908] ROSACEAE 261 
bracts lanceolate; hypanthium hemispheric, densely hairy inside; sepals ovate-acute or 
obtuse; petals rounded ; stamens unequal, the outer alternate with the petals, nearly twice 
as long as the inner; carpels much thickened on the back at the margins. 
TYPE LOCALITY: Santyaguillo, Mexico. 
DISTRIBUTION: Central Mexico. 
4. Vauquelinia californica (Torr.) Sargent, Gard. & Forest 
2: 400. 1889. 
Spiraea californica Torr. in Emory, Notes Mil. Rec. 140. 1848. 
Vauquelinia corymbosa Torr. Bot. Mex. Bound. 64. 1859. 
Vauquelinia Torreyi S. Wats. Proc. Am. Acad. 11: 147. 1876. 
A shrub or small tree, 5-6 m. high and with atrunk sometimes 18 cm. in diameter, with 
brown heart-wood and yellow sap-wood ; bark of the upright twigs reddish-brown, more or 
less densely covered with a white tomentum ; that of the trunk brown and broken ; petioles 
about 1 cm. long; leaf-blades lanceolate, usually acuminate or acute at the apex, acute or 
slightly rounded and often oblique at the base, finely dentate, finely puberulent when 
young, soon glabrous and yellowish-green above, finely tomentose beneath, 2.5-7 cm. long, 
0.5-1.5 cm. wide ; corymb many-flowered, tomentose ; hypanthium hemispheric, 3 mm. wide; 
sepals tomentose on both sides, ovate, acute, 1.5 mm. long; petals oval, 5 mm. long, white; 
stamens of about the same length; fruit ovoid, about 5 mm. long, pubescent. 
TYPE LOCALITY: High mountains near the Gila [Arizona]. 
DISTRIBUTION : Mountains of Arizona, Sonora, and Lower California. 
ILLUSTRATION : Sargent, Silva N. Am. 4: p/. 164. 
Tribe 5. HOLODISCEAE. Shrubs or small trees, with alternate, simple, 
toothed leaves and no stipules. Inflorescence racemose or paniculate. Hypan- 
thium saucer-shaped or hemispheric. Disk more or less developed, bearing 
about 20 stamens; anthers didymous. Pistils 5, alternate with the sepals, 
pubescent ; styles terminal; ovules 2, collateral, pendulous. Fruit indehis- 
cent, one-seeded, stipitate, laterally flattened. Seeds not appendaged ; endo- 
sperm a mere vestige. 
12. SERICOTHECA Raf. Sylva Tell. 152. 1838. 
Schizonotus Raf. New Fl. 3: 74. 1838. Not Schizoxotus Lindl. 1830. 
Spiraea § Holodiscus K. Koch, Dendr. 1: 309. 1869. 
Holodiscus Maxim. Acta Hort. Petrop. 6: 253. 1879. 
Sepals 5; 3-nerved, valvate in the bud, in fruit erect. Petals 5, white or pinkish, short- 
clawed. Stamens about 20. Achenes inclosed in the calyx, short-stipitate, long-hairy, 
membranaceous, indehiscent, caducous, strongly arched on the lower suture. Seeds broadly 
oblong, with double coat; embryo with superior radicle and ovate cotyledons. 
Type species, Spivaea argentea Kunth, which is the same as Spivaca argeniea L. f. 
Teeth of the leaves rounded to rounded-ovate, ending in a short mucro ; achenes straight on the 
upper edge ; stamens usually equaling the sepals. 
Leaves grayish- or whitish-tomentose and villous beneath. 
Inflorescence ample, well-compound ; leaves usually over 3 cm. long. 
Leaf-blades abruptly contracted below, scarcely decurrent on the petioles. 
Disk inconspicuous, leaves usually with many teeth. 
Leaf-blades thin, sparingly pubescent or glabrate above, usually 
acute at the base; sepals oblong or lance-oblong, obtuse or 
acutish. : 1. S. discolor. 
Leaf-blades thick and dark-green and densely short-pubescent 
(when young velvety) above, rounded or truncate at the 
base; sepals ovate, acute. 2, S. franciscana. 
Dise very thick and conspicuous ; leaves short with few teeth. 3. S. pachydisca, 
Leaf-blades cuneate at the base and distinctly decurrent on the 
winged petioles. 4. S. dumosa. 
Inflorescence stuall and narrow, simple, racemose, or with a few short, 
spreading branches ; leaves usually less than 2cm. long. _ 
Leaf-blades abruptly contracted at the base into the short petioles. 
Leaves 10-30 mm. long ; blades densely villous above, more or less 
doubly serrate ; sepals broadly ovate, 2 mm. long. 5. S. Boursiert. 
