39 
Stem 3—6-leaved; root-fibres 4—5, fleshy; spike dense-flowered ; 
perianth whitish; sepals and petals incurved; lip short, deeply 
3-lobed; the middle lobe the longest; spur short, about half as long 
as the ovary. 
Am.: West Greenl. 60°—69° 30’ ()), East Greenl. 60°—62° (!). 
Geogr, area: Iceland, Ferées, West and North Europe. Ural. 
Order XV. CYPERACEAE St. Hil. (By C. H. OsTENFELD). 
A. Most flowers bisexual (Scirpeae). 
a. Perianth of 6 or numerous filiform smooth bristles', which are much ex- 
SELtedmate Mn acuLitygen ime wca cer etna mene eal oe Sonn 1. Eriophorum. 
b. Perianth of 1—8 bristles, not exserted at maturity. 
aa. Style-base bulbiform persistent, separated from the summit of the 
acheney bys ananticulablouears =e eee) ol enni eine eis 2. Heleocharis. 
bb. Style-base passing gradually continously into the summit of the achene 
“B. All flowers unisexual (Cariceae). 3. Scirpus. 
a. Achene not enclosed in an utricle. 
aa. Spikelets consisting of one male and one female flower ... 4. Elyna. 
bb. Spikelets unisexual, one-flowered, the upper ones male, the lower ones 
WIG 5 goo ooo Fo OO MnO aC OUAaB OOK Oa ODO 5. Kobresia. 
Hae chenesenclosedginganmutricley-sstey wsdl ie) Cheers erst an eienent 6. Carex. 
1. ERIOPHORUM L. 
A. Spikelets several, umbellate; involucrum 1—4-leaved. 
a. Leaves flat, only triangular-channelled at the apex; peduncles of the spike- 
letsarougbases suyteia chet) ec oeione mantel bl secliotencueay cote ot « E. latifolium. 
b. Leaves flat in the lower part, triangular-channelled from about the middle; 
GMS Hib os sec enobaoobonoron mode upc E. polystachyum. 
B. Spike solitary, terminal; involucrum short or wanting. 
a. Tufted without stolons. 
aa. Large and dense tufts: culms numerous; anthers large, linear E. vaginatum. 
bb. Small and loose tufts; culms few; anthers small, obovate. . E. callithrix. 
b. Rhizome creeping, culms solitary. 
aa. Anthers small, obovate; bristles white .......... E. Scheuchzeri. 
bb. Anthers rather large, linear; bristles reddish-brown ... E. russeolum. 
85. E. latifolium Hoppe. 
Ledeb. Fl. Ross. IV p. 254; E. polystachyon Hook. Fl. bor. Am. II 
Fl Di tabs 133i: 
Culms obtusely triangular above; leaves flat, keeled, triangular- 
channelled at the apex; peduncles of the spikelets terete, rough; 
bristles numerous, rather long, white; anthers shorter than the 
filaments. 
We have not seen specimens of this plant from the Arctic regions and we 
think that the localities cited below should perhaps be classed under the following 
species, but we have taken it on the authority of Ledebour and Hooker. 
1 The so-called »bristles« (setae) in Eriophorum are not bristle-formed, they are ligulate. 
