378 BICKNELL: FERNS AND 
QUERCUS COCCINEA X VELUTINA? Ambiguous trees at Coskaty 
growing with Q. coccinea and (Q. velutina are difficult to under- 
stand except as hybrids of those species. 
Quercus palustris Muench. Besides the introduced pin oaks 
still persisting in the Thorn lot, a few scattered trees, the largest 
eight to ten feet in height, were observed among the Miacomet 
pines in 1909, and a single tree among pines south of the fair 
grounds in 1910. The latter had the appearance of being ad- 
ventive. 
Quercus bicolor Willd. Some small trees persist in the Thorn lot 
among the other introduced oaks previously reported as growing 
there. 
Humulus Lupulus L. Localities far from cultivated ground 
where the hop has every appearance of being indigenous are 
Trot’s swamp; west side of Long Pond; Swamp in Madequet, 
where there is much of it. 
Cannabis sativa L. Prospect Hill, herbarium of Miss Gardner; 
Pleasant Street, Mrs. Flynn. 
Rumex crispus L. Plants with the grain short and rounded 
seem to be less common than those with attenuate and acute 
grain (Rumex elongatus Guss.); the character, however, seems to 
be inconstant and even varies much in the same plant. 
Rumex persicarioides L. Dr. Harold St. John, who has revised 
our former understanding of this species (Rhodora 17: 73-83. 
pl. 113, f. 34. 1915), considers that the Nantucket plant should 
stand as Rumex maritimus var. fueginus (Phil.) Dusén. 
Polygonum maritimum L. Professor Fernald has convincingly 
shown that our plant is distinct from the European P. maritimum 
and should bear the name Polygonum glaucum Nutt. (Rhodora 
15: 68-73. 1913). 
Persicaria pensylvanica (L.) Small. Two varieties of this com- 
mon plant have recently been recognized by Professor Fernald 
(Rhodora 19: 70-73. 1917). The prevailing Nantucket form, 
described in Part V of this series, is Polygonum pensylvanicum 
var. nesophilum Fernald. The closely related var. laevigatum Fer- 
