1919] Fernald,— Ranunculus repens 169 
Corporation, Franklin County (4. Lorenz); Calypogeia sphagnicola, 
Mt. Desert (A. Lorenz); Notothylas orbicularis, West Farmington (A. 
Lorenz). . 
For Massachusetts: Riccardia pinguis, Richmond (A. W. E.); 
Pellia Neesiana and Lophocolea alata, Tolland (A. Lorenz). 
The census of New England Hepaticae now stands as follows: 
total number of species recorded, 191; number recorded from Maine, 
142; from New Hampshire, 151; from Vermont, 129; from Massa- 
chusetts, 121; from Rhode Island, 79; from Connecticut, 145; from 
all six states, 62. 
EXPLANATION OF PLATE 126. 
NARDIA OBSCURA Evans. 
1,2. Stems with perianths, Fig. 1 showing also a stolon, dorsal view, X 15. 
Figs. 3-5. Male stems, dorsal view, X 15. 6. Cells from the median por- 
tion of a leaf, x 265. 7. Marginal cells from the same leaf, X 265. 8. 
Longitudinal section of a young sporophyte and surrounding parts, X 25. 
Only a few of the rhizoids are represented, and the verruculae on the leaf-cells 
arenotshown. Figs. 4and 5 were drawn from a specimen collected at Beacon 
Falls, Connecticut, by the writer; the remaining figures, from the type speci- 
men, collected at the “V,” Waterville, New Hampshire, also by the writer. 
SHEFFIELD SCIENTIFIC SCHOOL, Yale University. 
THE VARIATIONS OF RANUNCULUS REPENS.— The commonly ' 
naturalized Swamp Buttercup, Ranunculus repens L., is so variable 
that American botanists are often perplexed to reconcile the extreme 
variations. These have been clearly differentiated in Europe and it 
may be useful to American students to have the following brief key 
to the more pronounced varieties. 
A. Middle leaflet of the basal leaves cuneate to subtruncate at base: petals 
5-9: stamens numerous B. 
B. Lobes and teeth of the leaves deltoid or ovate to oblong, obtuse or 
bluntish. 
Trailing or repent branches or stolons present. 
Stems and petioles distinctly pubescent. 
Pubescence appressed -siss .. «s d R. repens L. (typical). 
. Pubescence wide-spreading................ Var. villosus Lamotte. 
Stems and petioles glabrous or nearly so........ Var. glabratus DC. 
Trailing or repent branches wanting:............... Var. erectus DC. 
B. Lobes and teeth of the much-cleft leaves lanceolate to linear, acuminate. 
Var. linearilobus DC. 
A. Middle leaflet of the basal leaves rounded or subcordate at base: petals 
very numerous, forming a “double” flower. .. Var. pleniflorus Fernald. 
M. L. FERNALD, Gray Herbarium. 
