352 96. CYPERACE. 
7. Biysmus Panz. 
1. B. compressus (Panz.); st. rather triangular, spikelets 6—8- 
flowered, outer gl. shorter than the spikelet, bristles 3—6 strong 
persistent with declining tecth, 1. flat rough on the edges and 
keel.— Scirpus Sm., E.B.791. St. 85.6. R. viii. 293.—St. 6—8 
m. high. Outer gl. of lowest spikelet with a subulate leaflike 
point which often overtops the spike. Glumes reddish-brown, 
striated. Nut lenticular, shortly stalked, crowned with the long 
persistent style, shining.—Boggy pastures. P. VI. VII. E.S. 
2. B. rufus (Link); st. round, spikelets 2—4-flowered, outer 
gl. as long as the spikelet, bristles 1—6 slender deciduous with 
patent or ascending teeth, 1. channeled not keeled smooth.— 
Scirpus Sm., BE. B. 1010. St. 85.7. R. vii. 293.—St. slender. 
Gl. dark-brown, polished, not striated. Nut ovate with a long 
beak and very short stalk, opaque.—Marshes near the sea on the 
northern and western coasts. P. VII. 
8. Erropyorum Linn. Cotton-grass. 
* Bristles 4—6, at length crisped. Spike solitary. 
1. E. alpinum (L.); st. triquetrous scabrous, 1. very short, 
spike oblong.—E. B.311 (excl. the leafy shoot). R. vin. 288. St. 
10,—A slender elegant plant now nearly lost through the drainage 
of its place of growth.—Moss of Restenet, Forfar. Mr. Brown. 
Durness, Sutherlandshire. Prof. Balfour. P. VI. 8. 
** Bristles very numerous, not crisped.—f Spike solitary. 
2. E. vaginatum (L.); st. triangular above round below, spike 
oblong, nut obovate, 1. long setaceous triquetrous-chamneled, 
upper sheath inflated leafless —E. B. 873. R. viii. 289.—Bogs and 
moors. P.V. Hare’s-tail Cotton-grass. 
[3. E. capitatum (Sm.); “st. entirely round with a swelling 
sheath, spike roundish, glumes membranous.” —E. B.2387.—Ben 
Lawers near perpetual snow. Mr.G. Don. Mr. Don’s authentic 
specimen (Herb. Hook.) resembles E. capitatum, but the upper 
part of its st. is triangular. P. VIII.] Ss. 
tt Spikes more than one. 
4. E. angustifolium (Roth); st. nearly round, peduncles 
smooth, 1. lmeayr channeled their upper half triangular, filament 
equalling } of anth., nut elliptic-acuminate or obovate triquetrous. 
—E. B. 564. R. viii. 291.—Tall and rather slender. L. triangular 
through more than half their length. Bristles 3 or 4 times as 
long as the spikes.—8. minus; st. and]. very slender. E. gra- 
cile Sm., BE. B, 2402 (not Koch). An alpine form has but one 
