MARSILEACE^. 471 



2. SALVINIA. MicMi.— Salvinia. 

 (In honor of Salvini, an Italian professor.; 



Reproductive organs near the root solitary, or in racemes of 

 3 — 5, covered with brown rigid hairs. Upper ones of each ra- 

 ceme filled with innumerable spherical bodies, brownish and 

 reticulated ; lower ones more oblong, containing 6 — 18 larger 

 oblong-ovoid, brown and reticulated bodies, on short stout com- 

 pound pedicels. {Griffi,th,in Lind. Veg. King.) 



S. natans Willd. : leaves elliptic, subcordate, obtuse, with fascicles of 

 hairs above. MarsUea natans Limi. 



Lakes and still waters. Can. and Western N. Y. Pursh. Leaves opposite, 

 2-ranked, fine green. Floating on water like a iemna. Floating Salvinia. 



3. rSOETES. Z/zViTi.— Q.uill-Wort. 



(From the Greek tcoj, equal, and srof, the year, or evergreen.) 



Spore-cases membranaceous, oblong, 1 -celled, not openino-, 

 imbedded in the dilated base of the frond. Spores globose or 

 slightly angular, attached to numerous filiform receptacles which 

 traverse the capsule. 



/. riparia Engelman : emersed rhizoma small (orbicular 1) ; leaves slen- 

 der, soft, yellowish-green ; sheaths short (longer than broad) ; spores neatly 

 and minutely farinaceous and reticulated. (Sill. Jour. Jan. 1847.) 



In ponds and wet shady places. Banks of the Delaware below Philadelphia. 

 Chester county, Penn. Darlington. July, Aug. %.—Root or rhizoma 4 or 5 



Imes in diameter. Frorids numerous, 4—6 inches long, {Engelm.), 4 12 or 15 



inches, {Darlingt.), linear subulate, somewhat like the leaves of a Juncus. 

 Fructification oval-oblong, membranaceous, imbedded in the swollen base of the 

 frond. According to Professor Braun, /. lacustris has hitherto been found only 

 in middle and northern Europe. See Sill. Jour. Jan. 1847. 



Mud Quill-wort. 



