ST. JOHN: SABLE ISLAND. 89 



Centunculus minimus L. Locally found on bare sand flats 

 which are occasionally flooded by the sea. J. Macoun (C. no. 22,544) ; 

 H. St. John, no. 1,303 (H). 



FL, Fr. August. 



GENTIANACEAE. 



[SABBATIA CHLOROIDES Pursh. "The chief annual is of southern 

 extraction." The material on which this record of J. Macoun' s 

 (M. p. 2 18 A) is based is Centaurium umbellatum.] 



Bartonia iodandra Robinson, var. sabulonensis Fernald, n. 

 var., a forma typica recedit floribus numerosis (4-30), ramibus saepe 

 dichotomis, pedunculis valde clavatis, calyce valde fisso lobis pler- 

 umque distinctis. 



Differing from the typical form in its more numerous (4-30) 

 flowers; the branches often dichotomous; peduncles more clavate; 

 calyx deeply cleft, the lobes mostly distinct. 



NOVA SCOTIA: swampy edges of fresh ponds, Sable Island, August 

 30 and September 12, 1913, H. St. John, nos. 1,306, 1,307 (TYPE in 

 Gray Herb.). 



FL August and September. Fr. September. 



In typical Bartonia iodandra of Newfoundland and Cape Breton 

 the 1-7-flowered plants have simple branches and the peduncles are 

 more filiform. The calyx in all the Newfoundland and Cape Breton 

 material (examined from eight regions) is cleft only % to ^ to the 

 base, the tube being 1-2 mm long and nerveless. The Sable Island 

 plant with usually more numerous flowers on often forking branches 

 rarely has a definite calyx-tube, most of the material showing the 

 calyx with lobes distinct essentially to the base, the margins of the 

 outer lobes decurrent down the peduncle. In this character the 

 Sable Island plant approaches the more southern B. virginica (L.) 

 B S P. and B. paniculata (Michx.) Robinson, in both of which the 

 calyx-lobes are essentially distinct. In those more southern yellow- 

 ish-stemmed plants, however, the yellowish-green calyx-lobes and 

 the usually yellowish leaves are firm and subulate and the yellow 

 corolla is at most 5 mm. long. The Sable Island plant has the leaves 

 scattered or alternate as in B. paniculata but, like those of B. iodandra, 

 they are ovate to oblong-lanceolate, bluntish and purple. The stem 

 likewise is purple, the calyx-lobes flat and thin, ovate to oblong- 

 lanceolate, and the mature petaloid whitish corolla 5-6 mm. long, all 

 characters of B. iodandra. The anthers of B. iodandra are generally 



