24 ANALYTICAL KEY. 



Perianth free from the ovary or very nearly so — page 



Epiphytes or air plants, A\ith di-y and often scurfy leaves, 



(Tillandsia) PINEAPPLE F. 414 

 Stout aquatic herbs: flowers irregular as to the (corolla- 

 like) perianth or stamens, or both, 



PICKEREL WEED F. 452 

 Moss-like aquatic herb, with regular flowers . MAYACA F. 456 

 Terrestrial herbs or somttUnes woody plants, not rush-like 

 or f/rass-like — 

 Perianth of green sepals and colored petals which are 

 distinctly different — 

 Styles or sessile stigmas 3, separate: petals 3, not 

 ephemeral: leaves netted-veined, 



(Trillium) LILY F. 431 

 Style and stigma one: petals 3 or 2, ephemeral, 



SPIDEKWORT F. 453 

 Perianth icith all 6 {in one instance only 4) parts colored 

 alike or nearly so — 

 Anthers 1-celled: plants mostly climbing by tendrils 



on the petiole . . . SMILAX SUBF. 431 



Anthers 2-celled LILY F. 431 



Terrestrial or aquatic rush-like or f/rass-like plants, with 

 small regular flowers — 

 Not in a simple scaly-bracted head: perianth gluma- 



ceous, RU8H F. 45() 



In a simple spike or raceme : flowers bractless, perfect : 



perianth herbaceous . "WATP.R PLANTAIN F. 454 

 In a simple scaly-hracted head on a scape : leaves all 

 from the root — 

 Periantli yellow, the inner divisions or petals with 

 claws: flowers perfect: pod 1-celled, many 

 seeded, the placentae parietal, 



YELLOW-EYED GRASS F. 450 

 Perianth whitish: flowers monoecious or din-cious: 



pod 2-3-celled, 2-3-seeded . PIPEWORT F. 45G 

 OO Spadiceous Division, with flowers on a spadix or fleshy spike, peri- 

 anth none or not corolla^Uke, and no glumes. 

 Trees or icoody plants with simple trunk, caudex, or stock — 



Leaves persistent, long-petioled, fan-shaped and plaited or pinnate : 



si)adiv branrh.<l: floral envelopes of 3 or (; parts . PALM F. 463 

 Leaves undivided, long-linear and stifl;- . . . SCREW PINE F. 462 

 Immersed aquatics, branching and leafy . . . PONDWEED F. 457 

 Small or minute free-floating aquatics, with no distinction of stem and 



foliage DUCKWEED F. 457 



Reed-Hkp or Fhui-like morsh herbs, with linear and sessile nerved h-aves — 

 Flowprs iiakcil in tlic spike: no distinct perianth CAT-TAIL F. 401 



Flowers witli a fi-part.-d perianth . . . (Acorns) ARUM F. 457 

 Terrestrial or niarsli plants, with leaves of distinct blade and petiole, the 



veins netted ARUM F. 457 



000 Glumaceous Division, with flowers enveloped by glumes {chaffy 

 bracts), and no manifest perianth. 

 Ovarv 3-celled or 1-celled with 3 parietal placenta?, becoming a pod, 

 3-many-seeded : flowers with a regular perianth of six glnmaceons 

 divisions. In structure of the flower most like the Lily Family; 

 but the glumaceous perianth and the herbage imitate this division, 



* RUSH F. 456 



Ovary 1-celled, 1-ovuled, in fruit an akene or grain. True gluma- 

 ceous plants ; the glumes being bracts — 

 Glumes .single, bearing a flower in the axil . . SEDGE F. 465 

 Glumes in pairs, an outer pair for the spikelet, an inner pair for 



each flower GRASS F. 467 



II. Gymxosperms, icithout proper pistil, the ovules naked on a scale or 

 on the end of a short axis : cotyledons often more than two in a 

 vhorl. 

 With palm-like columnar trunks or corn-like stock, and pinnate 



palm-like foliage CYCAD F. 485 



With branching trunks, and simple, mostly needle-shaped, linear, or 



• scale-like entire leaves PINE F. 476 



