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FLOWERING PLANTS OF NANTUCKET 
*ARCTIUM TOMENTOsUM (Lam.) Schk. 
The common burdock of Nantucket, inhabiting barnyards 
and waste places all over the island. Often with very large 
cottony heads and otherwise strongly typical but sometimes with 
the heads smaller and only thinly arachnoid, more like those of 
A. minus. Occasional forms appear to approach A. Lappa L. 
which has not yet been detected on the island. In bloom from 
August through September. 
CIRSIUM LANCEOLATUM (L.) Hill. 
Roadsides and open places in all parts of the island but nowhere 
in abundance. Basal leaves only June 15, 1910; first flower 
July 14, 1912; blooming through September. 
Cirsium pDIscoLtor (Muhl.) Spreng. 
Locally common in the northeastern quarter of the island from 
Shawkemo to Polpis, Pocomo and, especially, in Squam. Most 
frequent about thickets near the shore. Comes into bloom the 
latest of the thistles. First flowers September IT, 1907. 
CiRstuM opoRATUM (Muhl.) Britton. 
Along roadsides, and widely scattered over the downs and 
commons. It is often strongly developed, and plants were ob- 
served bearing as many as nine flowering heads besides several not 
yet in bloom. First flowers June 20, 1910, June 27, 1912; mostly 
Past flowering in August, but flowering heads are not unusual late 
in the month and even in September. Heads of palest pink are 
frequent; occasionally they are pure white. 
CIRSIUM HORRIDULUM Michx. 
Common, mainly in brackish soil or in low grounds near the 
shore, but found as well in damp places in all parts of the island, 
and not infrequently in dry sandy soil, even among open — 
of pine. The flowering heads, normally of a yellowish — gh 
often deep reddish purple medially or, rarely, throughout. moh 
flowers June 2, 1909, June 7, 1908, June 7, 1911; some ae 
Past flowering by June 25, 1910; mostly out of bloom by ewou e 
of July or earlier; rarely a flowering head is produced in Sep- 
tember. 
