AllSMA. SAGITTABIA. 349 



with slender filaments. Oraries 3. Stigma sessile, downy. 

 Carpels compressed, inflated, diverging, 1 — 2-seeded, fcee. 



6, Tbiglochin. Perianth of 6 erect deciduous leaves. Stam. 

 6 ; anth. almost sessile. Ovaries 3 — 6. Stigmas sessile, 

 feathery. Carp, attached to an angular axis, from which 

 they at length separate at the base. 



Suborder I. Alismoidea. 

 1. Aiis'ma Linn. Water-Plantain. 



1. A. Plantdgo (L.) ; fl.-stalk panicled with whorled compound 

 branches, carp, ranged in a circle compressed blunt obovate, style 

 below the top of inner edge of carp., 1. cordate-ovate or lanceolate. 

 —E. B. 837. R. vii. t. 57.— L. aU radical, on long stalks. Sub- 

 mersed 1. linear. Fl. -stalks 2 — 3 ft, high. Fl. pale rose-colour. 

 Sep. ovate-oblong, styles twice as long as ovary. — ^. A. Imiceo- 

 lata (With.) ; 1. lanceolate narrowed below. Sy. E. B. 1438. 

 Sep. ovate, styles equalling the ovary. — By water. P. VII, 

 VIlL E. S. I. 



2. A. ranunado'ides (L.) ; fl.-stalks umbellate, carp, angular 

 acute forming a globose squarrose head, style terminal, 1. linear- 

 lanceolate acute. — S. B. 326. iJ. vii. t. 56. — L. all radical, on 

 long stalks. Fl.-stalks from 3 to 24 in. long, ending in 1 or 2 

 umbellate whorls of simple peduncles. Fl. pale purple. — /S. A. 

 repe/ns (Dav.) ; stoloniferous, producing 1. roots and fl. at the 

 nodes, fl. larger. E. B. 8. 2722. — Turfy bogs. /3. By lakes in 

 Wales and Ireland. P. VI. VH. E. S. I. 



3. A. nutans (L.); st. floating and rooting leafy, peduncle 

 simple fi:om the joinings of the stem, carp, striate beaked, float- 

 ing 1. stalked oblong blunt, radical leafless petioles broadly subu- 

 late. — E. B. 775. JJ. vii. t. 54. — St. slender, often very long. 

 Root-petioles in small tufts. Fl. rather large, white with a 

 yeUow spot. — Lakes, rare. P. VIII. E. I. 



2. AcTiNOCAK'pxrs E. Br. Thrumwort. 



1. A. Damasdnium (R. Br.) ; stalks with 1 — 3 whorls of fl., 

 carp, subulate compressed opening longitudinally, 1. cordate-ob- 

 long. — E. B. 1615. Alisma L. — L. all radical, floating, on 

 long stalks, S-veiued. Pet. white. Carp, large ; with 2 stalked 

 seeds, one from the lower angle erect, one from the upper hori- 

 zontal. — Ponds and ditches, rare. P. VI. VH. E. 



3. Sasitta'bia Linn. Arrowhead. 

 1. S. sagUtifdlia (L.) ; aerial 1, arrowshaped with lanceolate 



