ALISMA. — SAGITTARIA. 345 



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

 Fruit compressed, inflated, diverging, 1 — 2-seeded. 



6. Triglochin. 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. Alismoidem. 



1 . Alisma Linn. Water Plantain. 



1. A. Plantago (L,); fl. -stalk panicled with whorled com- 

 pound branches, carp, ranged in a circle compressed blunt ob- 

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

 or lanceolate. — E. B. 837. R. vii. 57. — L. all radical, on long 

 stalks. Submersed 1. linear. Fl.-stalks 2 — 3 feet high. Fl. pale 

 rose-colour.— ^. A. lanceolatum (With.) ; 1. lanceolate narrowed 

 below.— By water. P. VII. VIII. 



2. A. ranunculoides (L.) ; fl.-stalks umbellate, carp, angular 

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

 lanceolate acute. — E. B. 326. R. vii. t. 55. — L. all radical, on 

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

 bellate whorls of simple peduncles. Fl. pale purple. — 0. A. re- 

 pens (Dav.) ; plant depressed, umbels rooting and proliferous, fl. 

 larger. E. B. S. 2722.— Turfy bogs. /3. By lakes in Wales and 

 Scotland. P. VI. VII. 



3. A. natans (L.); st. floating and rooting leafy, peduncles 

 simple from the joinings of the stem, carp, striate beaked, float- 

 ing 1. stalked oblong obtuse, radical leafless petioles linear-taper- 

 ing. — E. B. 775. R. vii. t. 54. — St. slender, the few lowest 

 joinings rooting. Root-petioles in small tufts. Fl. rather large, 

 white with a yellow spot. — Lakes, rare. P. VIII. 



2. AcTiNOCARPUS R. Br. Thrumwort. 



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

 carp, subulate compressed opening longitudinally, 1. cordate- 

 oblong. — E. B. 1615. Alisma Sm. Damasonium stellatum Pers. 

 — L. all radical, floating, on long stalks. Pet. white. Carp, 

 large ; with 2 stalked seeds, 1 from the lower angle erect, the 

 other from the upper horizontal. — Ponds and ditches, rare. P. 

 VI. VII. E. 



3. Sagittaria Linn. Arrowhead. 



1. S. sagittifolia (L.); aerial 1. arrowshaped with lanceolate 

 straight lobes, fl.-stalk simple, fl. whorled. — JE.B. 84. R. vii. t. 53. 



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