BOTANY OF THE NORTHERN UNITED STATES. ci 



P. 573. 



AfRA (rather than Avena) caryophyllea, L., — resembling A. precox, but 

 taller, and with a very diffuse panicle of purplish and at length silvery scarious 

 spikelets, — was detected in abandoned fields reverting to forest, near Newcastle, 

 Delaware, by Wm. M. Canby. (Nat. from Eu.) 



P. 576. 



l\ Paspalimi WalteriaEiuai, Schult. Spikes few (3-7), the 

 lowest scarcely emerging from the sheath, the membranaceous rhachis blunt 

 and not projecting; spikelets glabrous. — Delaware (E. Tatnall, Wm. M. Canby) 

 and southward, in very wet places. 



P. 586. 



5\ Eqtlisetiam palustre, L. Stems 6' - 18' high, much more slender 

 than those of no. 5, and with numerous branches, roughish, with only 5-9 broad 

 and deep grooves separated by prominent narrow ridges ; sheaths with as many 

 elongated lance-subulate teeth, pale. — In wet places, Buffalo, New York (G. 

 W- Clinton), and northward. (Eu.) 



P. 592. 



3. Chcslanthcs lanuginosa, Nntt. in herb. Hook. Stalks slender, 

 at first hairy, black or brown, shining ; fronds (3' -8' high) delicate, lanceolate 

 in outline, woolly with soft whitish hairs, becoming smoother above, 3-pinnate ; 

 pinnae ovate, the lower ones distant ; pinnules crenately pinnatifid, or mostly 

 divided into minute roundish segments, the herbaceous margin recurved, forming 

 an almost continuous involucre. (C. vestita, Hook, &c. C. gracilis, Metten.) — 

 In dense tufts on dry rocks and cliffs, Wisconsin {T. J. Hale), Iowa, and west- 

 ward. — Ultimate pinnules exceedingly small and crowded. 



P. 606. 3. BIARSILEA, L. 



Submersed or emersed aquatic plants, with slender creeping rootstocks, send- 

 ing up elongated petioles, which bear at their apex a whorl of 4 nervose-veined 

 leaflets, and at or near their base, or sometimes on the rootstock, one or more 

 globular but somewhat excentric sporocarps. These sporocarps or fruit are 2- 

 celled vertically, and with many transverse partitions, and split or burst into 2 

 lobes at maturity. On the partitions are inserted numerous short-stalked spo- 

 rangia, of two sorts intermixed ; the larger ones containing a single oval or ob- 

 long spore, the smaller containing many very minute spores. 



1. M. Qtiadrifdlia, L. Leaflets broadly obovate-cuneate, glabrous; spo- 

 rocarps usually 2 or 3 on a short peduncle from near the base of the petioles, 

 pedicelled, glabrous or somewhat hairy. — In water, the leaflets commonly float- 

 ing on the surface, Bantam Lake, Litchfield, Connecticut, Dr. T. F. Allen. The 

 only known habitat in America ! (Eu.) 



2. Iff. vestita, Hook and Grev., with hairy leaflets and villous short-stalked 

 or sessile sporocarps, will doubtless be found in the western part of Wisconsin. 



