ANALYTICAL KEY. 25 



FLOWEKLESS oh CHVPTOGAMOUS. Plants not producing flow- page 



e/'.s', ji/'iipif</(il('il hi/ spares. 

 With iiiiiiiy-joiiiifd stems and no leaves, except the united scales or 

 teeth tliiit form a sheath or ring at each joint : spore cases in a 



terminal head or spike HORSETAIL F. 48(i 



With ample leurcs o/tc/t coutponnd, all from a rootstock or trunk, 

 and bearlnf/ the iniiiute spore cases — 

 Herbage circinate, or rolled up in the hud . . FERN F. 48') 

 Herbage erect (not rolled up) as it unfolds, 



ADDER'S TONGUE FERN F. 501 

 With scale-shaped, linear, or awl-shaped ajid wholly simple leaves 

 thickly set on the leafy stems : spore cases in the axil of some 

 of them — 



Spores all of one kind CLUB MOSS F. 501 



Spores of two unlike kinds . . . SELAGINELLA F. 503 



APPARENT EXCEPTIONS TO THE CLASSIFICATORY SCHEME. 



1. Key to those exogens lohich from their foliage might perhaps be mis- 

 taken for endogens. 

 Pistils indefinitely numerous: herbs, polypetalous, 



(Myosurus and some species of Ranunculus) CROWFOOT F. 31 

 Pistils 3-12, separate — 



Leaves peltate or round heart-shaped: aquatic, polvpetalous, 



WATER LILY F. 51 

 Leaves heart-shaped : marsh plants, apetalous, also destitute of 



calyx PEPPER F. 371 



Leaves thick and fleshy: polypetaldus or some few monopeta- 



lous : flowers completely syinmetrical . . ORPINE F. 170 

 Pistil one, but the ovary deeply ;;-2tJ-lobed or horned and style sepa- 

 rate : leaves thick and fleshy : polypetalous, 



FIG MARIGOLD F. 199 

 Pistil one, the ovary 4-lobed, and sessile stigmas separate: leaves 



slender: aquatics WATER MILFOIL F. 175 



Pistil one : ovary not lobed : polypetalous — 



Petals usually very numerous : ovary many-celled, many-seeded : 



aquatics WATER LILY" F. 51 



Petals with the sepals usually very numerous: style 1: ovary 

 1-celled, many-ovuled : fleshy, leafless plants, 



CACTUS F. 195 

 Petals and styles, also the stamens 5: ovary 1-celled, 1-nvnled, 



LEADWORT F. 271 

 Petals 5: styles 2 or 3: ovary 1-celled, many-ovuled, free from 



the calyx : leaves opposite . (Dianthus, etc.) PINK F. 73 

 Petals 5: styles 2: ovary 2-celled,2-ovuled: teeth of the calyx on 

 its summit: leaves alternate, 



(Eryngium, etc.) PARSLEY F. 200 

 Petals 5 or 3 ; style only one, not lobed — 



Calyx free from the 1-celled simple ovary : stamens 

 numerous 



(Acacias with phyllodia) MIMOSA SUBF. 122 

 Calyx adherent to the several-celled ovary : stamens S or 10, 



MELASTOISIA F. 17(5 

 Pistil only one, both as to ovary a)id style : monopetalous — 

 Stamens 5 : style 3-cleft at the apex: pod 3-celled, 



POLEMONIUM F. 295 

 Stamens 4: style and stigma one: corolla 4-cleft, dry and scari- 



ons: pod 2-celled: leaves ribbed . . PLANTAIN F. 35(; 

 Stamens 8 or 10: style and stigma one: corolla becoming dry 



andscarious: leaves narrow . (Heaths) HEATH F. 202 

 Pi.stil, if it may be so called, an open scale, or none, 



GYMNOSPERMS, 47() 



