PLANTS OF SOUTHERN NEW JERSEY. 637 



to Buena Vista. Nuttall's reference to a thirty-foot tree at 

 "Port Elizabeth [Z. ColHns]" probably refers to the village of 

 that name below Millville in Cumberland County and not to 

 Elizabeth in Union County, as given in Britton's Catalogue. 



It is stated by Willis to grow at Camden, according to Canby, 

 but I suspect this may have been an escape. 



This is one of a group of species v/hich push northv\'ard along 

 the Susquehanna Valley and again along the lower Delaware, 

 in each case following the arms of the Carolinian life zone, but 

 checked in their eastern extension in New Jersey by the arid 

 stretches of the Pine Barrens, which are quite unsuited to their 

 needs. 



Fl. — Late May to early June. Fr. — Early autumn. 



Middle District. — Above Swedesboro, Bridgeton (C), Port Elizabeth (C), 

 Buckshutem, Below Millville, Buena Vista (T), Near Landisville (probably 

 same location), Bradway (Bassett). 



Family GENTIANACE.E. Gentians, etc. 

 Key to the Species. 



a. Leaves reduced to scales, plants 1-3 dm. high. 



b. Sepals 2, flowers purplish, 8-12 mm. long. Obolaria, p. 643 



bb. Sepals 4, flowers greenish yellow, 2mm. long. 



c. Lobes of the corolla blunt and usually denticulate, plant generally 



strict and erect. Bartonia virginica, p. 643 



cc. Lobes of the corolla acute and entire, plant generally flexuous and 



paniculately branched, but sometimes strict. B. panictilata, p. 642 



aa. Leaves normal, plants 3-10 dm. high. 



b. Corolla blue, flowers 3-5 cm. long. 



c. Margin of petals fringed. Gcntiana crinita, p. 641 



cc. Petals not fringed. 



d. Leaves linear, mouth of corolla flaring open. 



G. porphyrto, p. 640 

 dd. Leaves ovate to lanceolate, corolla constricted at the mouth, 

 sometimes nearly closed. 

 e. Corolla lobes distinct, equal to or exceeding the inter- 

 vening plaits. G. saponaria, p. 642 

 ee. No perceptible lobes between the plaits. 



B. andrewsii, p. 641 



* In Britton's Manual Spigelia marylandica L. is given as ocurring in New 

 Jersey, "according to Gray." The new Gray's Manual ignores this reference 

 and restricts the plant to west of the Alkihenies, which, I have no doubt, 

 is correct. If it ever did occur in New Jersey it must have been an intro- 

 duction. 



