^^i{\ THE TASMANIAN FLORA. 



152. Leafless^ except sheaths on the stems, which are split on ^^^^.. ^^^^^^^^ 



one side •■• •; ."■• ;.'; ■■ icq 



Leafy, or if leafless, the sheaths on the stems not split ... loa. 



153. Plant i to 3 or 4 in. high ; flowers in small terminal heads • ^ . ,„ :^„„ 



enclosed in 2 hracts; leaves radical l^^^v'- CeMepide<r. 



Plant otherwise constructed ^°*' 



154. Plant leafy, the sheaths split throughout their length -. _ 



fruit a grain ••• '^''^i^' Gramirj^fE. 



Plant leafless or leafy, and then the leaf-sheaths entire. ,_. 



except in Gahnia ; fruit a small nnt, often shining Ixxxvm. Cyperacefp. 



155. Water or mud plants (except Triglochin centrocarpa) \ 



flowers small and numerous, or few and green loo- 

 Land plants; flowers conspicuous 1°'- 



156. Leaves opposite or whorled, i in. long, and very 



numerous ; flower solitary, axillary, never terminal ; or 

 the leaves long and flat, and the pistillate flower soli- 

 tary, on long spiral peduncles, and the ovary J- J in. 



]ojig Ixxiv. HydrocharidecE. 



Leaves, if opposite, distant, and exceeding i in., and 

 flowers terminal ; if the flowers are on a spiral peduncle, ,7 . , 



there are usually 4 together, and the ovaries minute ... Ixxxiv. NamdecB. 



157. Plant densely tufted ; leaves very narrow and hard ; 



flowers in small, dense, solitary, terminal heads, with 



brown overlapping bracts; perianth yellow Ixxx. Xyridacece. 



Plant not so constlMicted 158. 



158. Perianth inferior; if yellow, flowers numerous Ixxix. Liliacew. 



Perianth superior or partly so 159. 



Perianth inferior; fruit of 6 radiating carpels Ixxxv. Ah/^maceoe. 



159. Flowers generally irregular ; stamens combined with the 



style, to form a central column Ixxv. Orchidacecr . 



Flowers regular or nearly so; stamens distinct 160. 



160. Flowers blue, white, or green, seldom solitary ; leaves 



flat Ixxvii. Iridacem. 



Flowers solitary and yellow, with flat leaves, or reddish and 

 clustered, with cylindric leaves; stamens 6 Ixx^iii. Amaryttidacece. 



161. Plant bearing distinct green leaves, or, in some mosses, 



brown, white in Schizma they are reduced to linear 



stalks, often with comb-like appendages 162. 



Plant not bearing leaves, or, if portions assume that 

 character, they are not green, or are branches in whorls 

 at intervals, and are in both instances water-plants ... 166. 



162. Spore-sacks sessile in the axils of the leaves, or hidden 



m the leaf-sheath (p. 279.) ii/copo(fiace(P. 



Spore-sacks on the back or sides of leaves, or stalked ; if 

 sessile, on a creeping stem, and not enclosed in a leaf ... 163. 



163. Spore-sacks on the back or margin of leaves, or when on 



an apparently s_pecial process {Schizma, OpJiioglossum) ; 



the process is linear, comb-like or leaf-like (p. 281.) Filices. 



Spore-sacks round or oblong, solitary and stalked, except 

 in Pilularia, where they are sessile 164. 



164. Leaves linear, 1-2 in. ; spore-sacks nearly globular, sessile 



on the creeping stem (ip. 291.) Hydropteridce. 



Leaves small or minute 165. 



165. Leaves usually formed of small-celled tissue, and often 



with a midrib ; spore-sack generally opening at a ter- 

 minal orifice, never splitting into 4 spreading rays Musci. 



Leaves usually of coarse cells, never with a midrib ; spore- 

 sacks splitting into 4 spreading rays Repaticce. 



166. Plant flat, succulent, green, spreading on the ground or 



on trees, often with erect plates or umbrella-like pro- 

 cesses Repaticm. 



Plants otherwise formed 167. 



