22 ANALYTICAL KEY. 



Herbs, with slieathinsi: stipules above the tumid joints of the '"aok 

 stem: leaves alternate . . . BUCKWHEAT F. 367 



Herbs, with t/ic stii>iile^ {i/ ani/) not i» the form of sheafhs — 

 Pistils numerous or several: oalyx commoulv corolla-like: 



stipules none . . . ' . . CROWFOOT F 3i 

 Pistils .'{ 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 :" tlowers 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 

 solitary — 

 Style or stigma one and simple : flowers monoecious 



or dioecious ..... NETTLE F. 384 

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

 perfect — 

 Flowers crowded with dry and scarious bracts, 



AMARANTH F. 360 

 Floioers loithout imbricated and scarious bracts — 

 Leaves chiefly alternate, often toothed, cleft, 



or lobed . . . GOOSEFOOT F. 363 

 Leaves opposite, entire, 



CHICKWEED SUBF. 73 

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



without lol)es : aquatic . WATER MILFOIL F. 175 

 Calyx none, the flowers in catkin-like spikes, 



(Piper, etc.) PEPPER F. 374 

 Ovary 2-10-ceUed. with one or two ovules in each cell — 



Aquatic herbs, with ;V4-(;elled 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 3-l()bed pod : the ovules and seeds single or a 

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



except in the Box, etc SPURGE F. 379 



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



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

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

 key) — 

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



M.APLE SUBF. 109 

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



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

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



ELM SUBF. 384 

 Shrubs or trees with wingless 2-9-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 hangins;, 



(Fothergilla) WITCH-HAZEL F. 174 

 * • Flowers {all monwcious or diwcious) 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. 37^ 



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



