22 r ANALYTICAL KEY. 



Herts, with sheathing stipules above the tumid j oints o f the >*a» 

 stem: leaves alternate. . . BUCKWHEAT F. 367 



Herbs, with the stipules (if any) not in the form of sheaths— 

 Pistils numerous or several: calyx commonly corolla-like: 



stipules none CROWFOOT F. 34 



Pistils 3 or 4 : calyx and corolla none : flowers perfect, in a 



spike . . PEPPER F. 374 



Pistils 1-4, inclosed by the persistent calyx: leaves alter- 

 nate, pinnate or lobed, with stipules, 



(Poterium, etc.) ROSE F. 141 

 Pistil 1, with 2 hairy styles or stigmas: leaves palmately 



compound or cleft : flowers dioecious. HEMP SUBF. 385 

 Pistil only one : leaves simple — 



Calyx corolla-like (white), its tube coherent with the 

 ovary : flowers perfect : leaves alternate, 



SANDALWOOD F. 378 



Calyx corolla-like, free from the ovary, but the base of 



its tube hardening and persistent as a covering to 



the thin akene, making a sort of nut-like fruit: 



style and stigma simple . FOUR-O'CLOCK F. 358 



Calyx greenish, sometimes colored or corolla-like : seed 



Style or stigma one and simple : flowers monoecious 



or dioecious NETTLE F. 384 



Styles or stigmas 2 or 3, or 2-3-cleft : flowers mostly 



Flowers crowded with dry and scarious bracts, 



AMARANTH F. 360 

 Flowers without imbricated and scarious bracts — 

 Leaves chiefly alternate, often toothed, cleft, 



or lobed . . . GOOSEFOOT F. 363 

 Leaves opposite, entire, 



CHIOKWEED SUBF. 73 

 Calyx none, except as an adherent covering to the ovary, 



without lobes : aquatic . WATER MILFOIL F. 175 

 Calyx none, the flowers in catkin-like spikes, 



(Piper, etc.) PEPPER F. 374 

 Ovary 2-10-celled, with one or two ovules in each cell — 



Aquatic herbs, with 3-4-celled nut-like little fruits in the axils of 



the leaves or bracts .... WATER MILFOIL F. 175 

 Herbs, shrubs, rarely trees, with monoecious flowers, 3-celled 

 ovary and .'.Mo bed pod : the ovules and seeds single or a 

 pair hanging from the summit of the cell: juice milky, 



except in the Box, etc SPURGE F. 379 



Herbs, with stout hollow stems, perfect flowers, and 10-celled 



ovary, becoming berry-like . . . POKEWEED F. 367 

 Shrubs or trees, with 2-celled ovary, and winged fruit {samara or 

 key) — 

 Of two keys, joined at their base and winged from the apex, 



MAPLE SUBF. 109 

 Of a single key, winged from the apex or almost all round : 



leaves pinnate .... (Fraxinus) OLIVE F. 279 

 Of a single key, thin-winged all round : leaves simple, 



ELM SUBF. 384 

 Shrubs or trees with wingless 2-Q-celled fruit, no milky juice, 

 and — 

 Perfect or sometimes dioecious flowers : stamens 4-9 — 



Ovule hanging HOLLY F. 102 



Ovule erect BUCKTHORN F. 104 



Perfect flowers : stamens about 24, white : seeds hanging, 



(Fothergilla) WITCH-HAZEL F. 174 

 * * Flowers (all monoecious or dioecious) one or both sorts in catkins or 

 catkin-like heads. 

 Twining herb, with sterile flowers panicled, and fertile in a short 



scaly catkin (strobile) . . . (Humulus) NETTLE F. 384 

 Climbing and woody, or low herbs, with mostly, perfect flowers in 



slender spikes PEPPER F. 374 



Parasitic shrub, on trees : fruit a berry . . MISTLETOE F. 378 



