G82 ADDENDA. 



To page 584. 

 57'. Carex glaucescens, Ell. Sterile spike sinplo, long-pcdnnclcd ; fertile 

 spikes 3 - 10, cylindrical ( 1' - 2' long), on slender droopin<^ peduncles, most of 

 them staminatc at the summit ; lowest bract usually exceeding the culm, the 

 others shorter and bristle-like ; perigynia ovate, comi)ressed-3-anglcd, abruptly 

 pointed with a short nearly entire beak, nerveless except at the angles, glaucous, 

 longer than the chestnut-colored rough-awned scale ; culms 2° - 4° high, above 

 rough on the sharp angles ; leaves glaucous, rigid, nearly equalling the culms, 

 tapering gradually into a slender bristle-like apex. — Pinc-barrcn ponds, from 

 Portsmouth, Virginia ( \V. M. Canbi/) southward. 



To page 591. 

 96'. C. nigro-margin^ta, Schw. Culms some very short among the 

 bases of tlie leaves, some 8' - 10' high ; spikes 3, rarely 4 or .5, dark purple, the 

 terminal sterile one sometimes inconsjjicuous among the fertile, which are crowded 

 into a head, or the lowest occasionally remote and pcdunclcd ; bracts scale-like 

 and pointed, or the lowest rarely leafy and ctiualling or barely exceeding the 

 culm ; perigynia nerveless, pubescent, stipitate, oval and unequally 3-sided, 

 pointed with an obliquely notched beak ; scales ovate, obtuse, cuspidate, the 

 lowest somewhat lanceolate, deep purple with greenish centre, scarcely equalling 

 the perigynium. — Dry hillsides. New Jersey (and Pennsylvania ?), C. F. Aicstin, 

 C. F. Parker, Prof. Porter, C. E. Smith, and southward. Grows in close tufts, 

 and has remarkably rigid long and curved leaves. 



To page 615, after line 25. * 



3'. Calamagrostis Lapponica, Trin. Culm and rootstocks stouter 



than in C. strictu; the narrow ])anicle less deftse, and purplish spikclcts larger; 



glumes fully 2"' long, tapering to a point ; awn from much below the middle of 



tlic palet, stout. — Isle Royale, Lake Superior, Prof. T. C. Porta: Aug. (Eu.) 



To page 650, after No. 63. 

 G3\ ROTTBa:LI.IA, L. 



Spikelets in pairs at each joint of a terete slender sjiikc, awnless ; one impcr- 

 feet or rudimentary on a short and thick ai)])rcsscd pedicel ; the other sessile 

 and imbedded in an excavation of the joint of the rhachis, 2-flowered. Exterior 

 glume hard and cartilaginous, with a hinge-like transverse depression next the 

 base, the mner one boat-shaped and membranaceous. Palets thin and delicate, 

 one for the lower and staminatc or neutral flower, two for the u|)per and perfect 

 flower. Stamens 3. Styles 2. — Tall, or coarse perennials, with rigid stems, 

 and single cartilaginous sj)ikes terminating the stem and axillary branches, 

 chiefly subtn)])ical. (Named for Prof. C. F. Rutthixll, an excellent Danish 

 botanist, who wrote much ujion Gramineae, Cyi)eracere, &c.) 



1. R. rugbsa, Nutt. Culm flattish, 2° -4° high; leaves linear; spikes 

 l'-2' long, the lateral ones on short clustered branches in the axils, often 

 partly included in the sheaths of the leaves ; sterile flower neutral ; lower glume 

 transversely rugose. — Low pine-barrens, from S. Delaware ( W. M. Cuithij) 

 •outhward near the coast. Sept. - Oct. 



