92 TRIANDIRA DJGYNIA. cL. III. 



41. ROTTBO'LLIA. HARD-GRASS. 



Common receptacle elongated, jointed, ultimately separating, 

 alternately excavated to receive the flowers, of which there are 

 commonly two in each excavation, one of them only being 

 perfect. Calyx of two parallel lance-shaped valves, opposite 

 to the excavation. Corolla of the perfect flower of two lance- 

 shaped, membranous, nearly equal husks, inflected at the edges. 

 Nectary of two acute scales. Filaments thread-like ; anthers ob- 

 long, cleft at both ends. Germen oblong, obtuse. Styles short ; 

 stigmas feathery, spreading. Seed oblong, shut up in the cavity 

 of each joint of the receptacle by the closed husks, and falling off 

 along with it. Named after Professor Rottboll of Copenhagen. 



57. 



1. R. incurvdta. Sea Hard-grass. Spike cylindrical, slender ; chaff- 

 scales united below ; corolla awnless. Straws numerous, from three 



to five inches long, spreading, round, smooth, jointed, leafy: leaves short, 

 firm : spike very slender, hardly distinguishable from the straw. Annual : 

 flowers in July and August : grows on the sea-shore : rare. Eng. Bot. 

 vol. xi. pi. 760. Eng. FL vol. i. p. 176. 206. 



42. E'LYMUS. LYME-GRASS. 



Common receptacle elongated, alternately excavated and toothed 

 on each side. Spikelets two or more at each tooth. Calyx to each 

 spikelet of two unequal, broadly lance-shaped husks, the outer 

 largest, keeled, and pointed or awned, the inner cleft, inflected at 

 the edges, with a rib on each side. Nectary of two lance-shaped 

 scales. Filaments hair-like, very short ; anthers linear, notched at 

 both ends. Germen turbinate. Stigmas feathery, spreading ; seed 

 linear, channelled on the upper side, very hairy at the summit. 

 Name, elymos, of the Greeks. 58. 



1. E. arendrius. Upright Sea Lyme-grass. Spike erect, close ; calyx 

 lance-shaped, as long as the spikelets ; leaves stiff, with a thorny point. 



Root creeping : straws three or four feet high, erect, firm, round, 



striated, leafy : leaves hard and stiff, involute, with a thorny point : spike 

 from six to twelve inches long. Perennial : flowers in July : grows in 

 sand on the sea-shore, in England, Scotland and Ireland ; but not com- 

 mon. Eng. Bot. vol. xxiv. pi. 1672. Eng. Fl. vol. i. p. 177. 207. 



2. E. genicitldtui. Pendulous Sea Lyme-grass. Spike bent down- 

 wards, lax ; common receptacle winged ; calyx awl-shaped, longer than 



the spikelets ; leaves stiff, with a thorny point. Root fibrous : straws 



taller but more slender than in the last : spike nearly two feet long. 

 Perennial : flowers in July : grows in marshes near the coast : very rare. 

 Salt-marsh near Gravesend. Eng. Bot. vol. xxiii. pi. 1586. Eng. Fl. 

 vol. i. p. 178. 208. 



3. E. europa us. Wood Lyme-grass. Spike erect, close ; spikelets of 

 about two flowers, rough, awned ; calyx awned, as long as the spikelet ; 



leaves flat, pliant. Root fibrous; straw erect, two feet high, round, 



smooth, leafy: leaves lance-shaped, ribbed, flat, acute, rough : spike two 

 or three inches long, erect, close, green: spikelets three at each notch. 

 Perennial : flowers in June : grows in woods, thickets and hedges, in 



