Ci/nodon.] TRIANDRIA — DIGYNIA. 53 



48. RoTTBOLLiA. Linn. Hard-grass. 



1. R. incurvdta, L. (sea Hard-grass); spike cylindraceo-subu- 

 late,cal.2-valved, valves united at the base. E.Bot. <.760. — Ophi- 

 uriis, Beauv. — /3. spike filiform nearly erect. R.Jiliformis, Roth. 



Sea-shores ; but not common. On the south-west and east of Scot- 

 land. — /3. near Aberlady, Scotland. Near DubHn. Fl. July, Aug. 0.— 

 Plant from 2 — 6 or 8 inches high, more or less curved, especially in the 

 curious spike. — a, Inverkeithing, R. Andrew Robertson. 



49. Knappia. Sm. Knappia. 



1. K. agrostidea, Sm. {early Knappia). E. Bat. t. 1127. E. 

 FL V. i. p. 84. — Agrostis mitiima, Linn. — Mibora, Adans. Lindl. 

 — Chamagrostis, Bork. — Sturmia, Hopp. 



Sandy pastures by the sea, rare. Essex, near the mouth of the 

 Thames ; Wales, and S. W. coast of Anglesea, frequent. Fl. March, 

 April. 0. — A beautiful and minute grass, of which only one species is 

 known. Root fibrous. Stems several from the same root. Leaves 

 short, linear, rough, equal in length with their white, inflated sheaths. 

 <2al. of 2 dorsally compressed, truncated, purplish valves. Cor. of 2 

 white, delicate, very hairy, jagged valves, the outer one much the largest 

 and embracing the inner. Mr Wilson finds no scale. Styles long, fili- 

 form, hairy. Fruit beautifully dotted. 



50. Spartina. Willd. Cord-grass. 



1. S. stricta, Sm. (tivin-spiked Cord-grass); spikes 2 — 3, flowers 

 very hairy, larger cal.-valve acuminate, leaves shorter than the 

 spikes tapering at the base articulated upon the sheath lower 

 ones deciduous, rachis scarcely produced beyond the terminal 

 florets of each partial spike. E. FL v. i. p. 133. — Dactylis stricta, 

 E. Bot. t. 389. 



Muddy salt-marshes on the east and south-east coasts of England. 

 FL Aug.' 14.. — A remarkably stiff, rigid plant. Stems 6—8 inches, or a 

 foot and more high. Culms concealedby the sheathing bases of the 

 short pungent involute leaves. 



2. S. alternifiora, Loisel. {many-spiked Cord-grass); spikes 

 numerous, flowers glabrous, larger cal.-valve with strong lateral 

 nerves emarginate below the apex, leaves equal to or longer than 

 the spikes dilated at the base continuous with the sheath, and 

 all persistent, rachis much produced into a flexuose awn-like 

 point. Bromf. in Comp. to Bot. Mag. v. \\. p. 254. — S. glabra, 

 Muhl. — S. IcBvigata, Link. 



Itchen Ferry, Southampton. Dr Bromfield. Fl. Aug. I4.. — Much 

 taller than the preceding, and a very distinct species, well characterized 

 in the Memoir of Dr Bromfield. 



51. Cynodon. Rich. Dog's-Tooth grass. 



1. C. Ddctylon, Pers. {creeping Dog's-Tooth grass); spikes 

 digitate 3 — 5, cor. glabrous subciliated longer than the cal. 

 with a beardless bristle at the base of the interior valve. Br. 

 — Panicum, L. — E. Bot. t. 850. 



Rare : on the sandy shores of Cornwall, near Penzance. FL July, 

 Aug. 1^. 



