169 
Oxpzr CIV. POTAMOGETONACEA. 
(Navadacee [im part], p. 136.) 
Genus 1. Poramogrton. Pond-weed. 
P. TRICHOIDES. Fig. 1681. 
Stem very slender. Leaves subsetaceous, veined. Fruit with a 
straight inner edge toothed on each side near base. J uly, Aug. Baé. 
304. 
P. ZOSTERZFOLIUS. Fig. 1682. 
Leaves apiculate, covered all over with parallel veins (three principal 
ones). Spikes cylindric, on long fruit-stalks. Rivers and lakes. June. 
E. B.S. 2685. Bab. 353. 
P, FILIFORMIS. Fig. 1683. 
Leaves linear-setaceous. Spikes greatly interrupted. Fruit small, 
rounded on the back, without ridges. Forfar and Berwickshires ; rare. 
June, July. Bab. 355. 
Orper CIV’. NAIADACEA. 
Genus 1. Natas. 
NAIAS FLEXILIS. Fig. 1684. 
Leaves very narrow, ternate, pellucid, minutely denticled. Ovary 
solitary, sessile, oblong. Galway (Prof. Oliver). Aug. Bad. 356. 
Genus 2. Zostera. Grass-wrack. 
Z. MARINA, Var. ANGUSTIFOLIA. Fig. 1685. 
A variety with fewer leaf-veins and longer fruit-stalks. July, Aug. 
Bab. 356. 
Z. NANA. Fig. 1686. 
3 inches long. Leaves l-veined. Spadix short, banded. Nuts 
smooth. Muddy estuaries. July, Aug. Bad. 356. 
Orpur CV, CYPERACE/. 
Genus 8. EriopHorum. Cottun-grass. 
E. GRACILE. Fig. 1687, 
Tall, slender. Leaves narrow-linear, 3-angled. Peduncles downy. 
Nut oblong-linear. Bogs. Yorkshire,&c. June—Aug. £. B.S. 2886. 
Bab. 364. 
Genus 10. Carex. Sedge. 
C. GRAHAMI. _ __-Big. 1688. 
Barren spikes 1 or 2; fertile 2-3, ovate, blunt. Fruit twice as long 
as glume, oblong-ovate, inflated, narrowly ribbed. Beak short, bifid. 
Clova, &. July. #. B.S. 2923. Bad. 380. 
C. iRRIGUA. _ Fig. 1689, 
Leaves flat, smooth-edged. Fertile spikes 2-3, drooping, a few ¢ 
flowers at their base. Bracts broad, nearly flat. Glumes purple. 
Fruit round-ovate, faintly ribbed. Bogs. S.ofScotland. June. £. B.S. 
2895. Bab. 373. . 
C, MONTANA. __ Fig. 1690. 
Root fibrous. Stem slender. Fertile spikes 1-3, ovoid, crowded. 
Fruit oblong-obovate, hairy, with short notched beak. ‘Tunbridge, 
Chepstow. April, May. £. B.S. 2924. Bab. 375. 
Z 
