xxxvi 
ARTIFICIAL ANALYTICAL KEY 
ament, within an involucre which becomes a prickly bur; their 
calyces slender tubes overtopping ovary, the summit lobed, 
the throat bearing sterile stamens ; nuts large, lenticular. Castanea, p. 540 
Pistillate flowers in independent aments, spikes or heads. 
Pistillate inflorescence an ament with foliaceous or bladdery 
bracts; the calyx adnate to ovary and merely short-toothed 
at summit; fruit a hard -shelled nut; staminate ament pen- 
dulous, slender, brown-bracted, the flowers apetalous; each 
fork of filament with 1 locule of the anther. . Corylaceae, p. 530 
Inflorescence a dense spike or globose head of crowded flowers 
with basal calyx of 4 unequal sepals; stamens 4, with inflexed 
filaments. . Moraceae, p. 554 
J. Pistillate flowers not in aments, very dense heads or very dense 
spikes. . . N. 
N. Calyx wanting. 
Pistillate inflorescence a few-flowered head-like scale-covered 
small cluster, with 2-cleft red styles protruding; fruit a nut 
covered by a foliaceous toothed involucre; staminate aments 
drab, dry, pendulous, each bract with 4-8 bifurcate stamens; 
leaves and scars alternate. Corylus, p. 630 
Pistillate and staminate inflorescences small panicles or racemes, 
the pistillate of naked pedicel led flowers, the staminate in 
close bracted groups; style simple, stigma 2-lobed; fruit a 
drupe; stamens 2-4, simple; leaves opposite. . . . Forestiera , p. 1150 
N. Calyx present, at least in flowers. 
Calyx adnate to ovary; pistillate flowers without rudimentary 
stamens; seed with copious albumen; bark non-aromatic. 
Styles 3-5; ovary subtended or covered by an accrescent 
involucre which in fruit becomes a scaly cup or 4-parted 
bristly bur; fruit a nut'; staminate flowers in drooping 
moniliform or globular aments Faqaceae, p. 639 
Style 1; fruit a drupe, not covered by or embraced by a bur 
or scaly cup; staminate flowers not in aments. 
Inflorescence a spike and leaves alternate, or pistillate 
flowers solitary and short-stalked in axils of opposite 
leaves; calyx-teeth or -lobes definite at summit of ad- 
herent calyx in both flower and fruit. . . Santauaceae, p. 660 
Inflorescence of 1— few crowded sessile flowers at tip of 
slender spreading to drooping peduncles from axils of 
alternate leaves; calyx-teeth not evident at summit of 
drupe Nyssaceae, p. 1048 
Calyx free, of broad sepals or lobes. 
Loaves not scurfy, alternate, punctate-dotted, aromatic; sepals 
free or united at base, petal -like; pistillate flowers bearing 
rudimentary stamens; fruit a drupe, not overtopped by the 
calyx; anthers opening by pores and lids. . . Lauraceae, p. 677 
Leaves scurfy, opposite; calyx urceolate, 4-lobed at summit, 
the throat with an 8-lobed crown, loosely embracing the 
nut-like ovary and overtopping it, its tube becoming fleshy 
and red or orange in maturity; anthers without pores or lids. 
Shepherdia, p. 1045 
I. Slender twining vine with often palmately lobed long-petioled leaves 
and long-peduncled panicles; calyx of 6 petal-like sepals; 3 upright 
pistils capped by radiating star-like or fimbriate stigmas; stone of 
drupe somewhat cup-like or lunate; stamens numerous. 
Mentspermaceae, p. 674 
H.Leaves narrowly linear to linear-oblong, evergreen, rather crowded, 2—8 
mm. long; flowers axillary or in terminal small heads, without calyx but 
subtended by bracts or with 3 petal-like sepals; fruit a 3-9 seeded drupe; 
anthers versatile Empetraceae, p. 974 
E.Herbs. . . O. 
O.Leaves compound. 
Frail and brittle aquatic with whorled and finely dissected leaves; solitary 
involucrate flowers sessile in leaf-axils Ceratophyllaceae, p. 636 
Firm-stemmed terrestrial upright plants with alternate petioled ternately 
decompound leaves with distinct leaflets; flowers with petaloid or her- 
baceous sepals, in panicles or corymbs Thalictrum , p. 656 
O.Leaves simple, unlobed to deeply divided. . . P. 
