a, a 
CORYLUS CORYLACE 613 
BETULA 
small bractlets which become much enlarged and involucrate 
in fruit. Ovary imperfectly 2-celled, with 2 pendulous anatro- 
pous ovules. Seed solitary. 
1 CORYLUS L. Sp. 998. (Hazet-nur.) 
Shrubs or small trees with broad thin leaves that are plicate in 
the bud and small flowers that appear before the leaves; the sta- 
minate in drooping cylindrical aments, from lateral buds, without 
calyx but subtended by a scaly. bract, consisting of 4 stamens 
with forked filaments, each fork bearing one cell cf an anther, the 
undivided portion adnate to the bract. Pistillate flowers several 
in a scaly bud, 2 to each scale, each with a pair of bractlets that 
enlarge and in fruit more or less envelope the nut: calyx minute, 
adnate to the ovary, without limb. Style short: stigmas elonga- 
ted. Nut oblong or ovoid, large and bony. 
C. rostrata Ait. Hort. Kew. iii, 364. A shrub 3-8 feet high, with 
pubescent branchlets and smooth bark: leaves ovate or narrowly oval, acu- 
minate. cordate or obtuse at base, incised-serrate and serrulate, glabrous 
or with some scattered appressed hairs above, sparingly pubescent, at least 
on the veins beneath, 214-4 inches long, on petioles 2-4 lines long: involu- 
cral bracts bristly hairy, united to the summit and prolonged into a tubular 
beak about» twice as long asthe nut; laciniate at the summit: nut ovoid, 
scarcely cumpressed, striate, 5-7 lines high. In thickets, Oregon to Brit. 
Columbia, the Eastern States and Nova Scotia. 
C. Californica Rose. A shrub or small tree 4-30 feet high with pubes- 
cent branchlets: leaves orbicular to obovate, 1-4 inches broad, often shortly 
acuminate, obscurely 6-10-lobed, sharply serrate, on petioles 5-12 lines 
long, mostly subcordate at base, sparsely pubescent above, soft-pubescen 
on the veins beneath: involucre united to the summit, prolonged into a 
broad tubular beak about twice as long as the nut or less, setose-hispid 
below with short brittie hairs, erose to lacerate at the summit: nut ovoid 
rR nee high. Common on low hillsides and in forests, Brit. Columbia to 
alifornia. 
Orper XC BETULACEA Agardh Apho. 208 in part. 
Trees or shrubs with deciduous alternate leaves, mostly cadu- 
cous stipules and small monwcious flowers, the staminate in long 
aments, the pistillatein shorter cone-like aments with thickened 
and rigid scales. Staminate flowers 3-6 together in the axil of 
each bract, consisting of a membranous calyx and 2-4 stamens 
inserted on the receptacle, with distinct filaments and 2-celled 
anthers. Pistillate aments spike-like or capitate, its flowers with 
or without a calyx adnate to the 2-celled ovary which is crowned 
with 2 sessile filiform stigmas and becomes a winged or angled 
nutlet. Seed anatropous, pendulous, without albumen. Cotyle- 
dons flat, foliaceous in germination. 
1 Betula Bracts 3-lobed, becoming coriaceous, deciduous: stamens 2, 
with bifurcate filaments and separate anther-cells: nutlets broadly 
winged. | 
2 Alnus Bracts entire, becoming woody, persistent: stamens 4; anther- 
cells contiguous. 
