424 
LXXXV1II. HYDROCHARIDACE^E. \_Andcharis. 
Leaves radical , with usually a sharply serrate margin , often 
floating, rarely rigid and submerged. Flowers whitish. — In 
Boottia, an East-Indian genus, there are 9 — 15 stigmas and cells 
to the ovary and fruit. 
1. Anacharis. Ovary 1-celled. Stigmas 3. Leaves verticillate. 
2. Hydrocharis. Ovary 6-celled. Stigmas G, euneate, bifid. Flowers 
9 — 12-androus. 
3. Stratiotes. Ovary 6-celled. Stigmas G, linear, bifid. Flowers 
polyandrous. 
1. Anacharis Rich. Anacharis. 
Dioecious. Spatha tubular, bifid at the apex, nearly sessile, 
containing a single flower. — Barren fl. Perianth 6-partite. 
Stam. 9. — Fertile fl. Tube of the perianth filiform, elongate ; 
limb 6-partite. Sterile stamens 3, subulate. Style filiform, 
cohering with the tube of the perianth. Stigmas 3. Fruit 
baccate, 1-celled, few-seeded. — Leaves verticillate or opposite, 
sessile. — Name: ava, without, and x a P l £> elegance; apparently 
in contrast to the next genus. 
1. A . * Alsinustrum Bab. (long -flowered A.); leaves 3 — 4 in 
a whorl linear- or oval-oblong minutely serrulate, spatha of 
the fertile flower many times longer than the ovary, stigmas 
ligulate. Bab. in Ann. Nat. Hist. ser. 2. i. p. 83. t. 8. A. 
Nuttallii Planch. Udora Canadensis Nutt. Elodea Rich. 
Ponds, ditches, canals, and streams, now too generally diffused. 
11. 7 — 10. — It is now known to be a purely American species, 
but the mode in which it arrived in this country remains as great a 
mystery as ever. The stigmas are usually 3, although 2 were observed 
by Mr. Babington ; Mr. Kirk finds 3, but only 2 sterile stamens; 
these are occasional aberrations, there being 3 of each, unless when 
an accidental abortion has taken place. The stigmas are only emar- 
ginate in the British plant, but have a longitudinal line indicating 
a tendency to be bifid after being fertilised. The sterile plant has not 
been observed in this country. 
2. Hydrocharis Linn. Frog-bit. 
Dioecious. — Barren fl. Spatha 2-leaved, .shortly stalked, 
about 2 — 3-flowered. Perianth 6-partite. Stam 9 — 12, con- 
nected at the base, surrounding 3 imperfect styles. — Fertile fl. 
on a long stalk, within the radical 1 -leaved spatha. Tube 
of the perianth scarcely longer than the ovary ; limb 6-cleft. 
Sterile stamens 6. Stigmas 6, oblong euneate, bifid, the seg- 
ments divaricating. Fruit coriaceous, roundish, 6-celled, 
many-seeded. — Leaves stalked, reniform. — Named from vCuip, 
water, and x a P‘C> elegance ; being showy aquatic plants. 
1. H. Mdrsus- Ranee L. ( common F.) : E. B. t. 808. 
