724 REPORT OF NEW JERSEY STATE MUSEUM. 



Cape Afoji.— Seaville (S), Bennett (S), Court House (S), Cape May.* 



Nabalus serpentarius (Pursh.). Pursh's Rattlesnake -Root. 



Prenanthes Serpentaria Pursh, FI. Am. Sept. 499. 1814 [Mts. of Virginia and 

 Carolina]. — Britton iSS (in part). 



Frequent in the Pine Barrens and occasional on the coast. 

 PL — ^Late August to early October. 



Pine Barrens. — Whitings (S), Pasadena, Atsion (S), Malaga (S), Land- 

 isville, Pleasant Mills, Egg Harbor City. 

 Coast Strip. — Piermont (S). 



Nabalus virgatus (Michx.). Pine Barren Rattlesnake-Root. 



Prenanthes virgata Michaux, Fl. Bor. Am. II. 83. 1803 [Virginia and 



Carolina].— Pursh, Fl. Am. Sept. II. 498. 1814. 

 Prenanthus aututrtmalis Britton 155. 

 Nabalus virgatus Keller and Brown 312. 



Open sandy ground in the Pline Barrens. 



This slender-spiked Rattlesniake-root is a plant of the centra] 

 Pine Barrens, associated with Solidago stricta and Lacinaria 

 grammifolia pilosa plants with a similar form of inflorescence. 



Fl. — Early September to early October. 



Pine Barrens. — Manchester (C), Brindletown, Bamber, Cox's, Brown's 

 Mills (KB), Jones' Mill (S), Cedar Grove (S), Chatsworth, Woodmansie 

 (KB), Atsion (Leeds), Jackson (P), Cedar Brook, Winslow Jnc, Hammon- 

 ton (S), Quaker Bridge (C), Pleasant Mills, Batsto, Egg Harbor City, 

 Mays Landing (C), Woodbine (KB), Elwood (P). 



Nabalus a'ibus (L.). White Rattlesnake-Root. 



Prenanthes alba Linnaeus, Sp. PI. 798. 1753 [Carolina, Virginia and Pennsyf- 

 vania], — Britton 155. 



Commlon in the northern counties ; rare within our limits and 



confined to the Middle district. 



Fl. — ^Late August to early October. 



Middle District. — Burlington, Mannington (C). 



Family AMBROSIACELE. 

 Key to the Species. 



a, Staminate and pistillate flowers in the same heads. Iva, p. 725 



aa. Staminate and pistillate flowers in separate heads. 



b. Pistillate involucre a conspicuous ovoid, spiny bur, leaves rough, 

 irregularly dentate or somewhat lobed. 



' Lippincott's Cape May record for N. virgatus (KB) proves to be this. 



