724 REPORT OF NEW JERSEY STATE MUSEUM. 



Cape Maj.— 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 155 (in part). 



Frequent in the Pine Barrens and occasional on the coast. 

 Fl. — 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. H. 83. 1803 [Virginia and 



Carolina]. — Pursh, FI. Am. Sept. H. 498. 1814. 

 Prenanthns autunmalis Britton 155. 

 Nabalus virgatus Keller and Brown 312. 



Open sandy ground in the Pine Barrens. 



This slender-spiked Rattlesnake-root is a plant of the central 

 Pine Barrens, associated with Solidago stricta and Lacinaria 

 graminifolia pilosa plants with a similar form of inflorescence. 



Fl. — Early Septeinber 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 aibus (L.). White Rattlesnake-Root. 



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

 vania]. — Britton 155. 



ComtrDon 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 AMBROSIACE^. 

 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. 



