oper ae: Ors ae ha TO ge Ee 
1917} Fernald,—A new Cardamine from southern Maine 91 
A NEW CARDAMINE FROM SOUTHERN MAINE. 
M. L. FERNALD. 
CARDAMINE Longii, n. sp. Differt a C. pensylvanica: foliis simpli- 
cibus reniformibus vel suborbicularibus 0.5-1.5 cm. longis petiolatis 
basi cordatis vel rotundatis, rarissime inferioribus cum 2 foliolis latera- 
libus parvis; floribus apetalis 0.7-1.2 mm. longis subsessilibus: sili- 
quis subsessilibus patentibus vel adscendentibus subulatis 5-8 mm. 
longis in stylum 0.5-1 mm. longum attenuatis; seminibus ovatis 
flavis brunneo-marginatis 1.2 mm. longis 0.8 mm. latis. 
Differing from C. pensylvanica in having the leaves simple, reni- 
form or suborbicular, 0.5-1.5 cm. long, petioled, cordate or rounded 
at base, very rarely the lower with 2 small lateral leaflets: flowers 
apetalous, 0.7-1.2 mm. long, subsessile: siliques subsessile, spreading 
or ascending, subulate, 5-8 mm. long, attenuate to a style 0.5-1 mm. 
long: seeds ovate, yellow, brown-margined, 1.2 mm. long, 0.8 mm. 
wide.— Marne: shaded rock-pockets and crevices covered at high 
tide, Cathance River, Bowdoinham, September 14 and 19, 1916, 
Fernald & Long, no. 13,698 (TYPE in Gray Herb.); also on tidal mud- 
flats of Cathance River, Bowdoinham, no. 13,697. 
A remarkable little plant with which it is a pleasure to associate 
the name of Mr. Bayard Long, the writer’s companion on many col- 
lecting trips. Differing at once from C. pensylvanica Muhl., C. 
hirsuta. L., C. flexuosa With., C. parviflora L. and their allies in its 
usually entire rounded or cordate leaves, its minute apetalous flowers 
and its very short almost sessile capsules. In the type locality the 
plant was in the shelter of an overhanging ledge and the carpet of 
plants so strongly suggested Chrysosplenium that we at first thought 
we had found a strange species of that genus. 
On the tidal flats and rock-pockets along Cathance River, Carda- 
mine Longii is associated with a remarkable colony of estuarine species: 
Sagittaria heterophylla Pursh (first definite station in Maine); Eleo- 
charis diandra C. Wright; Scirpus Smithii Gray, var. setosus Fernald; 
S. fluviatilis (Torr.) Gray; Eriocaulon Parkeri Robinson (found also 
on the flats of other tributaries of the Kennebec and on the tidal 
reaches of the Penobscot); Nuphar advena (Ait.) Ait. f. (the first 
known station for true N. advena east of New York); Tillaea aquatica 
L.; Elatine americana (Pursh) Arn. (see RHODORA, xix. 10-13); 
Samolus floribundus HBK. (here.as on the lower Penobscot delighting 
