CLXX. NAIADACEE. (J. D. Hooker.) 563 
or submerged or floating, base sheathing; stipules 0 or within the sheath. 
s inconspicuous, usually green, 1-2-sexual. Perianth 0, or tubular, 
x of 3-4 inferior valvate segments. Stamens hypogynous; anthers 
-2-celled. Ovary of 1-4 1-ovuled carpels, style long or short, stigma 
Mots: ovule erect or pendulous. Fruit of l-seeded utricles achenes or 
pelets. Seed exalbuminous; embryo straight or curved, radicular end 
very large.—'l'emperate and tropical; genera 16, sp. about 120. 
* Stigmas discoid or decurrent on the ovary. 
t Perianth of sepals or scales. Flowers bisexual. 
Marsh herbs, Sepals 6, herbaceous green . . . . . 1. TRIGLocHIN. 
lcs. Sepals 1-3, white, membranous . . . . . 2. APONOGRTON. 
tics. Sepals 4, herbaceous, green . . . . . . . . 3. POTAMOGETON. 
tt Perianth 0. Flowers uni- or bi-sexual. 
aties, Stamen 2. Carpelsstipitate . . . . . . . . 4 RUPPIA. 
tics. Stamen 1. Carpels sessile . . . . . . . . . 5. ZANNIOHELLIA. 
* oque . 
Stigmas subulate or capillary. Flowers unisexual. 
P : 
reh or brackish aquatics. Perianth hyaline . . . . . . 6. NAIAS. 
PerianthO. . . . 2.2.5... T. CYMODOCEA. 
1. TRIGLOCHIN, Li. 
Se igerous marsh herbs. Leaves rush-like, flat or terete. Flowers 
herba; Isexual, spicate or racemose, 2-bracteate. Perianth-segments 3 or 6, 
wn US, concave, deciduous. Stamens 6, inserted on the base of the 
3 ents; anthers didymous, slits extrorse. Carpels 6, 1-celled, 1-ovuled, 
ae aie often imperfect; styles short, often connate, stigmas peni- 
ed ovules basilar, erect, anatropous. Fruit of 3 or 6 free or 
traight achenes or follicles with recurved tips. Seed erect; embryo 
‘—Genus cosmopolitan; species about 12. 
de palustre, Linn. Sp. Pl. 338; leaves j-terete throughout, fruit 
iii, ug , carpels 3 slender attached to the axis by a point. Kunth Enum. 
doa? eich), Ic. Fl. Germ. vii. t. 51; Boiss. Fl. Orient. v. 13.—Tri- 
I Grif. Notul. iii, 204; Ic. Pl. Asiat. t. 271. 
o PERATE and ALPINE HIMALAYA, and WesTeRN TIBET, alt. 8-15,00€ 
STRIB. N. temp. regions and S. America. . 
e; tree in, tuberous and stoloniferous. eer gl ing E we 
E e elongatin r flowering, pedicels short. en, 
SÉ, Arten purple KN A iu. long, appressed to the rachis; carpels 
&-—p 
2m 
,". maritimum, Linn. Sp. Pl. 339; leaves slightly flattened at 
Gr fruit oblong of 6 separable carpels. Kunth Enum. iii. 145; 
Te. Fl. Germ, vii. t. 52; Boiss. Fl. Orient. v. 13. 
MPERATE and ALPINE HIMALAYA, and WESTERN TIBET, from 12,000-16,000 
Distrig, N. temp. regions. 
tveg ` > Stouter, and more tuberous at the base than T. palustre. Scape stout, 
Vía, not e longer, but not elongating so much in fruit; flowers larger ; fruit 
*Ppressed to the scape, carpels grooved on the back. 
002 
