ANALYTICAL KEY- 23 



Trees or shrubs — page 



With resinous juice, needle-shaped or scale-like leaves, and a 



cone (strobile) for fruit PINE F. 476 



With milky or colored juice, sterile flowers iu spikes or ra- 

 cemes and fertile iu catkin-like heads or short spikes, 

 forming a fleshy mass in fruit, inclosing the akenes, 



FIG SUBF. 385 

 With colorless juice, often strong-scented resinous-aromatic bark, 

 pinnate leaves, and only sterile flowers in catkins, 



WALNUT F. 390 

 With colorless juice and simple leaves — 



Both kinds of flowers in short catkins or heads : fruit waxy- 

 coated, berry-like or nut-like : leaves aromatic, 



SWEET GALE F. 392 

 Both kinds of flowers in scaly catkins : the fertile with 2 or 3 

 flowers, forming winged or sometimes wingless akenes 

 or small keys, under each scale or bract, 



(Betula, Alnus) OAK F. 392 

 Both kinds of flowers in catkins, dioecious, one under each 

 scale or bract: pod filled with downy-tufted seeds, 



WILLOW F. 399 

 Both kinds of flowers in heads, moncecious, without calyx : 

 leaves palmately-lobed — 

 Fruit of many two-beaked hard pods in a head : stipules 



deciduous .... WITCH-HAZEL F. 174 

 Fruit a head of club-shaped hairy-based nutlets : stipules 



sheathing .... PLANE TREE F. 389 



Both kinds of flowers or commonly only the sterUe in cat- 

 kins : fruit a nut in a scaly cup, or bur, or sac, or leafy- 



bracted involucre OAK F. 392 



-H+MoxocoTYLEDONS OR Endogens, wlth wood in separate threads scat- 

 tered through the diameter of the stem, not in a circle, no annual 

 circles or layers; leaves mostly parallel-veined ; and parts of the 

 flower almost always in threes, never in fives ; cotyledon 1. 

 O Pctaloideous Division, with flowers not on a spadiz, and perianth or 

 part of it more or less corolla-like. 

 Pistils more than one, mostly numerous, separate or nearly so: peri- 

 ,111th of 3 green sepals and 3 colored petals: leaves mostly 

 netted-veined between the ribs . WATER PLANTAIN F. 454 

 Pistil only one as to the ovary — 



Perianth adherent to the ovary, or superior, i.e. ovary inferior — 

 Flowers dioecious : stem twining: leaves with distinct petiole 



and blade, the veins or veinlets netted . . YAM F. 430 

 Flowers dioecious or polygamous: aquatic herbs: flowers 



from a spathe FROGBIT F. 402 



Flowers perfect — 



Anthers only one or two, borne on or imited with the 



style or stigma : flower irregular . ORCHIS F. 403 

 Anther only one, embracing the slender style but not 

 united with it, 2-celled : flower irregular, 



GINGER SUBF. 410 

 Anther onlv one, free from the style, 1-ce lled : flower 



irregular .... ARROWROOT SUBF. 410 

 Anthers 5 (one abortive filament without any anther): 



flower somewhat irregular . . BANANA F. 410 

 Anthers 3, turned outwards : filaments either separate 



or monadelphous .... . IRIS F. 415 



Anthers 3, fixed by the middle: flower wooUv outside, 



(Lachnanthes) BLOODWORT F. 414 

 Anthers 6. all the stamens being perfect — 



Epiphvtes or air plants, except the Pineapple. 



PINEAPPLE F. 414 

 Terrestrial plants, chiefly from, bulbs or corms, some 

 from tuber.^, fibrous i^oots, or ruot,'<talks — 

 Perianth woolly or much roughened outside, 



BLOODWORT F. 414 

 Perianth not woolly or roughened without, 



AMARYLLIS F. 424 



