FLOWERING PLANTS OF NANTUCKET 383 
Macbride who considers them referable, perhaps not without 
some uncertainty, to A. arenaria Suksd. of the northwest. 
Thymus Serpyllum L. Law nor Sankaty Bluff, August 28, 
1915, Miss Gardner. 
Setiscapella subulata (L.) Barnhart. Peat bog between Polpis 
and Quidnet, 1915, Miss Gardner. 
Houstonia caerulea L. Miss Alice O. Albertson has sent me an 
interesting specimen of this species collected on the Nantucket 
golf course, May 13, 1916. It is matted and subspreading, the 
stems and long peduncles relatively stout, and the flowers large, 
spreading 1.5 cm. in the pressed plant; the calyx lobes are oblong 
to obovate-oblong and more or less foliaceous, becoming 1.5 mm. 
or more wide, with somewhat spreading tips, and equalling the 
short and broad tube of the corolla in the single specimen seen. 
Viburnum venosum Britton. The largest example seen, Rattle- 
snake bank, June 8, 1911, was of the stature of a small tree, the 
trunk eleven inches in girth near the base. 
Lactuca virosa L. Collected by Miss Gardner in the town, 
August 24, 1915, a second station on Nantucket for this intruding 
weed, and too probably an indication that it is becoming estab- 
lished there. 
ADDENDUM 
Under Sabbatia campanulata in Part XIV of this series read, 
on page 32, S. stellaris for S. campanulata. 
The following two plants, new to Nantucket, have recently 
come to light in a collection of specimens kindly sent to me by 
Mrs. Flynn: 
*HELIANTHUS PETIOLARIS Nutt. Old field near Windmill, 
August 5, 1911, collected by Mrs. Nellie F. Flynn. 
*KOELLIA INCANA (L.) Kuntze. Collected by Miss Mina K. 
Goddard, August 17, 1895. : Locality not mentioned. The species 
is an interesting addition to the native flora of Nantucket. Mrs. 
Flynn, who has recently made inquiries in regard to this specimen, 
writes me that Miss Goddard believes it was probably found at 
Wauwinet where, as disclosed by her records, she collected plants 
on the very date that appeared on the specimen label. 
