PLend.ph . 6. FLUVIAT. 26. Potamogit. 37 
14. Potamogiton pusillum. Dwarf riverweed . 
Leaves linear, opposite and alternate, distant, spreading 
at the base, narrower than the stipulae ; stem round, very 
slender, branchy ; peduncles axillary : spike many flowered. 
Pot. pusillum, gramineo folio, caule tereti, Raii Syn. 150, 15. 
Potamogeton pusillum, Lin. S. P. 184. 
Ditches and ponds on a clay bottom ; perennial ; July. 
Plant sunk, except the spike when in flower; stipulce 
embracing the stem ; peduncles solitary, longer than the 
spike; spike ovate, small. 
IV. 27. ZOSTER A. Linnaeus. Grasswrack . 
Flower monoicous or dioicous, resting on a one-sided 
leaflike spadix ; perigonium none ; anther round ; pollen 
connected by fibres ; style 2-cut ; capsule membranaceous, 
] -seeded. — Root fibrous; stem round, decumbent, rooting 
at the joints, leafy; leaves flat, linear, alternate, grasslike; 
spadix flat, from a cleft in the leaflike, sessile spatha. 
Zostera marina. Sea grasswrack . 
Leaves not nicked, slightly 3-nerved ; stem roundish. 
Alga, Ger. cm. 1569 ; Raii Syn. 52, 1. 
A. marina gramina minor, Raii Syn. 52,2. 
A. marina graminea angustifolia seminifera ramosior, Raii Syn. 52, 3. 
Alga q. Potamogeiton marinum in utriculis epiphyllospermon minus 
Doody, Raii Syn. 53,4. 
A. angustifolia vitriariorum, Raii Syn. 53, 5. 
Fucus marinus sive Alga marina graminea, Park. 1242. 
Zostera marina, Lin.S. P. 1374. 
Sea-shores, saltwater ditches; perennial; August. 
Stem smooth, kneed ; leaves opening a little above the 
base with a longitudinal slit, exserting a linear spadix 
bearing flowers on one side ; anther single, sessile, at the 
side of the germen; germen oblong, sessile; stigmata two, 
linear ; capsule elliptic, hanging. 
The scaly hairs at the base of this plant, being detached 
and felted into balls by the action of the waves of the sea, 
and roasted to blackness, are used in diseases of the lym- 
phatic system, in the same manner and with the same in- 
tent as burnt sponge. 
(3. latifolia. Leaves broad, very evidently 3-ribbed. 
II. 7. A ROIDEiE, Jussieu; Piperitarum pars, Lin. 
Flowers monoicous, sessile, round a simple spadix ; in- 
volucrum a one-leafed spatha; perigonium none; stamens 
numerous, aggregated round the spadix ; anthers inverse ; 
