i 



i' 



s. 



TrigUcMn.'] C. juncaginace^; 471 



w 



radical peduncles ; but these runners are the true scapes, the umbels 

 having taken root, and thrown out a few leaves. 



3, Sagittaria Linn* Arrow-head, 



r 



Monoecious. — ■ Barren ji, Stam. numerous-. — Fertile fi. 

 Styles many. Achenes very numerous, distinct, collected into a 

 head^ 1-seeded, compressed, margined. — Named from mgitta, 

 an arrow^ on account of the shape of its leaves. 



1. S, sagittifolia L. (common A,) ; leaves arrow-shaped, the 

 lobes lanceolate straight, scapes simple with whorled simple 

 short branches. E. B. t. 84. 



Ditches and margins of rivers in England and Ireland. Near Glas- 

 gow, but scarcely indigenous, 1/.. 7 — 9. — A beautiful aquatic, with 

 large truly arrow-shaped leaves^ rising above the surface of the water. 



5^*^*5^ 



Perianth none or inconspicuous. Nerves of leaves usually 



longitudinal, (Ord. C. — CV.) 



f Plants sometimes^ though rarely^ aquatic^ never (except Spar- 

 ganium natans) submerged or ^floating. (Ord. C. — CIII.) 



Ord. C. JUNCAGINACE^ Jlich.-^ 



Flowers perfecty lower ones or all stalked or reflexed. 



Perianth uniform, rarely none, sometimes coloured but scarcely 



petaloid. Stamens hypogynous. Anthers turned outwards. 



Ovaries superior, united or distinct. Ovules solitary or twOy 



approximate at the base, erect. Styles or stigmas 3 — 6- Peri-^ 



carps indehiscent or 2-valved. Embryo without (or ? very 



rarely in the axis of mealy) albumen^ having the same direction 



as the seedy with a lateral cleft for the emission of the plumule. 



Marsh HerbSj with narrow radical leaves. Flowers spiked or 

 racemed. ' 



1. TiUGLocHiN. Anthers almost sessile. Ovary 1, 3 — 6-celIed. Flowers 



in a straight naked spike or raceme. 



2, ScHEucHZERiA, Anthcrs on a slender filament. Ovaries 3. Flowers 



in a flexuose hracteated raceme, 



1. Tkiglochii?t Linn. Arrow-grass. 



Perianth of 6, erect, concave, deciduous leaves, 3 outer, and 

 3 inner inserted a little higher than the others. Stamens 6, 



1 This Order, smaH though it be, requires revialon as to its limits, and ought 

 perhaps to be confined to Triglochin and Tetroncittm, in which case the spur- 

 Iniited species of Triglochin may form a third genus. The Order might then he 

 called rriglochinaccce, and the name Juncaginaceie be abolished as liable to be 

 confcimdcd in sound -with Jumacece^ 



