AOROSTIDE.E. 333 



garis has a short truncate ligulo, and the panicle after flowering more 

 or less spreading.'' S. Wats. Bot. Calif. 271 (1880). 



A. vulgaris thrives on dry land, A. alba loves marshes. A. 

 stolonifera is a stoloniferous state of this species. Michigan, Clark 

 2307, 2309. For further particulars see Vol. 1, p. 148, Fig. 70. 



22. A. GiGANTEA Gaud. Agrost. Helv. 1:189 (1811) not 

 Koth. 



Culms robust, GO-120 cm. high, more or less creeping at the 

 base. Sheaths scabrid or smooth; ligule lacerate, 3-5 cm. long; 

 blades flat, scabrous above and below, pungent-pointed, 12-18 cm. 

 long, G-11 mm. wide. Panicle, linear-lanceolate or ovate-lanceo- 

 late, usually brownish or reddish green, 15-25 cm. long; rays of 

 lower node of panicle crowded, scabrous, 15-25 in number, the 

 longest 6-12 cm. long, branching and flower-bearing on tlie upper 

 half; some of the rays less than 1 cm. long, second whorl 3-5 cm. 

 distant, with somewhat fewer rays. Spikelets about 2 mm. long, in 

 detail varying, and apparently much like those of A. alba L. Mas- 

 sachusetts (moist land near Boston Harbor), C. E. Faxon in 1878, 

 E. L. Sturtevant ; Sackett's Harbor, Lake Ontario, in 1833, labelled 

 A. alba L. by A. Gray, in his herbarium. 



In the herbarium of Harvard University are several plants of 

 this appearance from various parts of Europe, and variously labelled, 

 most of them as A. alba L., though often with another name below. 



23. A. Oregonensis Vasey, Bull. Torr. Club, 13:55 (188G). 

 Culms smooth, slender, about GO cm. high. Sheaths smooth ; 



ligule 2 mm. long; blades of the sterile shoots filiform, those of the 

 culm soft, 3 in number, very narrow, involute, G-10 cm. long. 

 Panicle thin, dark purple, lanceolate, nodding, 10-12 cm. long, 

 rays smooth, capillary, in clusters of 3-5, the longest 4-5 cm. long, 

 flower-bearing for about two-fifths of the extremities. Spikelets 

 lanceolate, slightly scabrous on the keels, 2-2.5 mm. long, the 

 three glumes reaching to the same height; first glume 1-nerved, sec- 

 ond faintly 3-nerved below; floral glume broad-oval when spread, 

 5-nerved, obtuse, apex lacerate-toothed, unawned; palea 0; hairs 

 at the base very few and short. 



"The panicle approaches that of A. hiemalis, but is shorter. 



