120 
tia (2?) sceroclada Rupr., 1. ¢. p. 638, tab.6; Colpodium fulvum Ledeb. FI. 
toss. IV p. 385; C. pendulinum Ledeb. |. c. p. 386; Schmidt, Fl. Jeniss. 
aret. p. 127; C. Malmgreni Anders. Ofvers. Vetensk. Akad. Férh. 1866, 
p. 121 tab. 2, f. 1; Poa fulva Trin. (1818); Hook. Fl. bor. Am. II p. 247; 
Poa pendulina J. Vahl, Fl. D. tab. 2343; Glyceria pendulina Lest. (1833). 
Rhizome thick, widely creeping. Culm erect, smooth. Leaves 
broadly linear, flat, smooth, gradually acuminate; ligule elongate, ob- 
tuse. Panicle pyramidal with long capillary branches, spikelets 2—7- 
flowered, glumes obtuse or acute, somewhat shorter than the pales 
of the lowermost flowers; pales obtuse with short hairs at the base. 
Varying much in size and the form of the panicle; the most 
remarkable forms is the form from Lapland, A. pendulina, with 
about 70 cm. high culms, narrow and long leaves, arcuate-drooping 
panicle and many-flowered spikelets, and the form from Greenland, 
A. effusa, with lower culms, broader and shorter leaves, recurved 
panicle- branches and 2 

3-flowered spikelets, but these extremes 
are gradually combined with each other by the numerous Siberian 
forms. A form with one-flowered spikelets is Colpodium Malmgreni 
Anders., Arctophila effusa f. depauperata Nath. 
Am.: St. Lawrence Island, Port Clarence, Kotzebue Sound, Point 
Barrow, Arctic Coast, Nottingham and Mansfield Islands in Hudson 
Strait. West Greenl. 64° 10'’—65° 20’ (). Eur.: Spitsbergen, Kolguey, 
Dolgoi Island, Novaya Zemlya to 74°, Waigats, Habarowa, Samoyede 
Land (!). As.: Arctic Coast (!), Boganida (!), Mouths of the Yenissei and 
Lena, Chukches Land. 
Geogr. area: Lapland, Northern Russia, Northern Siberia, Kam- 
chatka. 
A. Biennial or annual 
b. Perennial. 
a. Stoloniferous. 
(ee Spikeletsraboutslicni elon veseeee a cuemees cme leicht iene P. glumaris. 
2. Spikelets about 5 mm. long. 
TERE aT Or I Gd ira Ra Dora rere ono eat end P. annua. 
* Pale evidently 5-veined, on the dorsal vein and the marginal veins 
hairy with long woolly hairs, for the rest glabrous. . . P. pratensis. 
** Pale indistinctly veined, in the lower part, but especially on the back 
and the margins hairy with appressed silky hairs .... P. cenisia. 
b, Czespitose. 
1), Bases of the culm bulbous) thickened#.) .) 005 <5) sw wo) = P. bulbosa. 
2. Base of the culm not bulbous thickened. : 
* Leaves short, abruptly acuminate, three times as broad as the culm 
d P. alpina. 
** Leaves narrower. 
+ Spikelets broad-ovate, about 3-flowered, panicle oblong. 
° Culm slender, somewhat arching, leaves flat, soft. ... P. laxa. 
°° Culm rigid, straight, leaves convolute, rigid ... P. abbreviata. 
