294 Rhodora [DECEMBER 
sylvania, but it is not yet a weed of broad distribution. In the Gray 
Herbarium there is a sheet of Z. A/sPidws collected by the late 
George Thurber in “meadows” at Providence in August, 1844. Yet 
there is no evidence that the plant has spread in that region. Mr. 
J. Franklin Collins informs me that he has never found the plant; 
nor is it represented from Providence in the older local herbaria 
which he has examined. The species may yet be found established 
in Rhode Island; but it is worthy of note that while Z. autumnalis, 
introduced into New England in the 40's, has become an every-day 
weed, Z. Aispidus, collected at Providence in 1844, has apparently 
never obtained a foothold. 
The four forms of the genus thus far known in America may be 
distinguished as follows: 
* Scape branching: peduncle scaly-bracteate: heads before anthesis erect : 
pappus a single row of plumose bristles. 
L. AvTUMNALIS, L. Spec. ii. 798.  Involucre glabrous or slightly 
pubescent. — Fields and roadsides, Newfoundland to Ontario, 
Michigan and Pennsylvania, flowering from late May to October. 
Var. PRATENSIS, Koch, Syn. 418. Involucre and tips of peduncles 
densely soft-pubescent.— Maing, Orono, July 12, 1897 (M. L. 
Fernald): MassacHusETTS, Dorchester, June 2, 1895 (JW. Deane); 
Canton, July 11, 1899 (F. G. Floyd); Siasconset, Nantucket, June 
9, 1900 (M. A. Day, no. 80): CONNECTICUT, Southington, June 5, 
1898 (Z. Andrews). 
* * Scape simple and naked: heads betore anthesis nodding: pappus 
double. 
L. HISPIDUS, L. Spec. ii. 799. Scape 1.5 to 3 dm. high: involucre 
conspicuously bristly-hirsute: all the achenes with plumose pappus.— 
RHODE IsLAND, meadows, Providence, Aug. 1844 (Geo. Thurber), not 
since seen: New York, ballast, Hunters Point, New York City, Aug., 
1879 (Addison Brown). 
L. HIRTUS, L. Spec. ed. 2, ii. 1123. Scape 1 to 2 dm. high: involucre 
glabrous; pappus of outer achenes mostly plumeless.— Ballast, New 
York City (Addison Brown), Philadelphia (C. F. Parker, 7. C. 
Martindale): naturalized near Victoria, Vancouver Island (John Ball 
et, al). Reported from Seidersville, Pennsylvania. 
GRAY HERBARIUM. 
