1G9 
Order CIV. FOTAMOGETONACE/E. 
(Naiadacecc [in part], p. 13G.) 
Genus 1. Potamogeton. Pond-weed. 
P. trichoides. Fig. 1681. 
Stem very slender. Leaves subsetaceous, veined. Fruit with a 
straight inner edge toothed on each side near base. July, Aug. Bab. 
354. 
P. zostera:folius. 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. 
Order CIV'. NAIADACE^. 
Genus 1. Naias. 
Naias flexilis. Fig. 1684. 
Leaves very narrow, ternate, pellucid, minutely denticled. Ovary 
solitary, sessile, oblong. Galway (Prof. Oliver). Aug. Bab. 356. 
Genus 2. Zostera. Grass-wrack. 
Z. MARINA, var. ANGUSTIFOLIA. Fig. 1685. 
A variety with fewer leaf-veins and longer fruit-stalks. July, Aug. 
Bub. 356. 
Z. nana. Fig. 1686. 
3 inches long. Leaves 1-veined. Spadix short, banded. Nuts 
smooth. Muddy estuaries. July, Aug. Bab. 356. 
Order CV. CYPERACE^E. 
Genus 8. Eriophorum. Cotton-grass. 
E. gracile. Fig. 1687. 
Tall, slender. Leaves narrow-linear, 3-angled. Peduncles downy. 
Nut oblong-linear. Bogs. Yorkshire, &c. June—Aug. E. B. S. 2886. 
Bab. 364. 
Genus 10. Carex. Sedge. 
C. Grahami. Fig. 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, &c. July. E.B.S. 2923. Bab. 380. 
C. irrigua. Fig. 1689. 
Leaves flat, smooth-edged. Fertile spikes 2-3, drooping, a few 3 
flowers at their base. Bracts broad, nearly flat. Glumes purple. 
Fruit round-ovate, faintly ribbed. Bogs. S. of Scotland. June. E.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. E.B.S. 2924. Mab. 3/5. 
z 
