ADDITIONAL DELAWARE CO. PLANTS. 69 



1 Dryopteris marginalis (L.) A. Gray. [ Aspidium mar- 



ginale ( L. ) Sw. ] 



2 Carex vircsretis Muhl. [C. virescens swanii Fernald.] 



3 Carex laxifiora Lam. 



4 Ju7icus rnarginatiis Rostk. 



5 Cerastmni longipednncHlatum Muhl. [C. nutans Raf.] 



6 Ranjuicuhis septenthonalis Poir. 



7 Rosa humilis Marsh. 



The following plants are native. Many have long been 

 known, but under different designations, and not distin- 

 guished from closely allied species. A few, as Hydrocoiyle 

 ranunctdoides L. f. and Lobelia piiberiila Michx., have cer- 

 tainly not before been reported from the county. 



1 Asplenium angustifolium Michx. 



A small colony growing in a cold ravine in the 

 Barrens of Middletown Township. 



2 Carex hystricina Muhl. 



Probably an accidental omission, though hardly a 

 common plant. 



3 Arisaema pusillum (Peck) N.ish. 



Seems cjuite distinct from A. tripliylhim (L.) Torr., 

 with which Robinson and Fernald reunite it. A smaller, 

 in every way more slender plant, commencing to flower 

 much later ; leaves bright green, not pale beneath ; 

 hood of spathe deep brown to black within. Frequent 

 in rich woodland swamps. 



4 Juncus secundus Beauv. 



A. slender, tufted species, frequent on the Serpentine. 

 Earlier flowered than /. tenuis Willd., with which it 

 has mostly been confused. The record of /. gerardi 

 Loisel. from the Serpentine at Newtown, should be 

 changed to this species. Dr. George Smith's plant in 

 the Institute collection is undoubtedly /. seczindiis. J . 



