ANALYTICAL KEY. 29 



Stamens 6, dissimilar, or only three with perfect anthers. 

 Sepals 3, herbaceous ; ephemeral petals 3, unequal. 



COMMELINACE^E, 538 



Perianth tubular, 6-lobed PONTEDERIACE^, 535 



Stamens 3, similar. Moss-like aquatic. . . . MATACE^J, 537 

 Perianth wholly glumaceous, of 6 similar divisions. . JUNCACE^J, 539 

 Perianth partly glumaceous or chaff -like ; flowers in very 



dense heads. Rush-like or aquatic. 

 Flowers perfect ; inner perianth of three yellow petals ; 

 perfect stamens and plumose sterile filaments each 

 3 ; pod 1 -celled, many-seeded on 3 parietal placentas. XYRIDACE^E, 536 

 Flowers monoecious or dioecious, whitish-bearded ; sta- 

 mens 4 or 3; pod 2 - 3-celled, 2 - 3-seeded. . ERIOCAULE.E, 566 

 C. GLUMACEOUS DIVISION. Flowers destitute of proper perianth, except 



sometimes small scales or bristles, but covered by scale-like bracts or glumes. 

 Glume a single scale-like bract with a flower in its axil. . CYPERACE^E, 567 

 Glumes in pairs, of two sorts. . \ "'.'.' GRAMINEJE, 623 



CLASS III. CEYPTOGAMOUS ACEOGENS. (See p. 17.) 



SUBCLASS I. PTERIDOPHYTES : with woody fibres and vessels. 



Spores of only one kind ; spore-cases 



Borne beneath shield-shaped scales in a terminal spike; stems 



naked, sheathed at the nodes EQUISETACE^E, 675 



On the back or margin of fronds circinate in vernation. FILICES, 678 



Bivalvular, in special spikes or panicles ; fronds erect in vernation, 



from short erect rootstocks. . . . OPHIOGLOSSACEJE, 693 



Solitarv in the axils of leaves, 2 - 3-valved ; low long-stemmed moss- 

 like evergreens; leaves small, in 4-16 ranks. LYCOPODIACE^, 695 

 Spores of two kinds, large and small ; spore-cases 



Solitary in the axils of small 4-ranked leaves, or in the bases of 



linear radical leaves. .... SELAGINELLACEJE, 697 



Enclosed in peduncled sporocarps ; leaves 4-foliolate. MARSILIACEJE, 700 



Sporocarps sessile beneath the stem; small, floating, pinnately 



branched, with minute imbricate leaves. . SALVINIACE^, 701 



SUBCLASS II. BRYOPHYTES : with cellular tissue only. [Cap- 

 sules not operculate, containing spores and usually elaters, in the fol- 

 lowing Orders.] 

 Capsule 4-valved, pedicellate ; plants leafy-stemmed, rarely thallose. 



JUNGERMANNIACE^E, 702 



Capsule 2-valved or valveless ; plants thallose. 



Thallus without epidermis; capsule with a columella, short-pedi- 



cellecl or sessile on the thallus. . . ANTHOCEROTACE^E, 726 

 Capsules borne beneath a pedunculate receptacle. MARCHANTIACE^E, 727 

 Capsules immersed in the thallus or sessile upon it, indehiscent. 



, 730 



