348 
B. Flowers monacious or diwcious, one or both sorts in catkina, 
1. Only one sort of flowers in catkins or catkin-like heads. 
Fertile flowers in a short catkin, head, or strobile...-..-.-......... UrTICACEE, 405 
Fertile flowers single or clustered; sterile in slender catkins (ex- 
cept in Fagus). 
Leaves pinnate; fertile flowers and fruit naked.............2... JUGLANDE®, 410 
Leaves simple; fertile flowers 1 to 3 in an involucre or cup.....CUPULIFER&, 412 
2. Both sterile and fertile flowers in catkins or catkin-like heads. 
Ovary and pod 1-celled, many-seeded; seeds furnished with a downy 
tuft at one end...... 2.2.2. ee ee cee eee SALICINEA, 418 
Ovary 1 or 2-celled, only one ovule in each cell; fruit 1-seeded. 
Parasitic on trees; fruit a berry .....2-..........2....2..---- LORANTHACE, 384 
Trees or shrubs, not parasitic. 
Calyx regular, in the fertile flower succulent in fruit .......... URTICACE, 405 
Calyx none, or rudimentary and seale-like., 
Style and stigma 1, simple; flowers in heads .............. PLATANACE, 409 
Styles or long stigmas 2; fertile flowers 2 or 3 at each scale 
of the catkin.... 2.2... 0002020. oe ee ce eee eee eee eee CUPULIFER®, 412 
Subclass Il, MONOCOTYLEDON 2: Those whose embryos have a single 
cotyledon; the fibro-vascular bundles of whose stems are distrib- 
uted irregularly (thus forming no central pith); whose leaves are 
mostly parallel-veined, and flowers usually 3-merous (never 5- 
merous). 
A. SpapicEous Division, Flowers aggregated on a spadiz or fleshu axis, or sometimes 
ggreg ip . q ’ 
scattered, mostly destitute of calyx and corolla, and also without glumes. 
Little floating aquatics, with no distinction of stem and foliage ....LEMNACE&, 453 
Immersed aquatics, branching and leafy .......2....222..02222.0... NAIADACK.A, 456 
Reed or flag-like marsh herbs, with linear and sessile-nerved leaves ; 
flowers in spikes or heads ..........-2..2.2. 0202022222000 cee seen TYPHACE.E, 452 
Terrestrial plants, with petioled leaves. 
Herbs; leaves net-veined ....2...2222. 222220 cee ce cc ee cee eee ARACE, 452 
Trees; leaves fan-shaped ............ 00020002222. cence ee eee eee eee ee PaLtm®, 452 
B, PETALOIDEOUS DIVISION, Flowers not collected on a spadix, furnished with floral 
envelopes (perianth) answering to calyx, or to both calyx and corolla, either herbaceous 
or colored and petal-like (except in Juncacea), 
1. Perianth adherent to the whole surface of the ovary. 
Flowers dimcious (rarely perfeet), regular. 
Aquatics; ovules and seeds several or numerous ........--.- HYDPROCHARIDE®, 421 
Twiners; ovules and seeds 1 or 2 in each cell.......-....-... DIOsconkEACEA, 430 
Flowers perfect; ovules and seeds usually numerous, 
Stameus only 1 or 2; tlower irregular, gynandrous............-..- ORCHIDE, 422 
Stamens 3. “ 
Anthers introrse, opening transversely.................--- BURMANNIACE®, 422 
Anthers extrorse, opening lengthwise ..... beeen cece ec eee cee ececees IRIDEA, 426 
Stamens 6; tlowers usually on a scape or from a bulb......... AMARYLLIDER, 429 
