PRETZ: FLORA OF LEHIGH CouNTY, PENNSYLVANIA 73 
Woobs!A optusa (Spreng.) Torr. 
Of frequent occurrence and often abundant on the shale and 
limestone formations, especially on outcrops and in rocky woods 
along the Jordan Creek and the Little Lehigh River. It may be 
expected throughout on these formations. Recorded on the South 
Mountains from Lower Milford (Krout), along the Lehigh River 
(May 19, 1900, Lewis A. Ink, in Muhlenberg College herbarium), 
and Vera Cruz (February 22, 1908). There is no record from the 
Kittatinny Mountains. Very abundant 14 mile northwest of 
Kernsville along the Jordan. Grows in the open and in the shade. 
Fertile fronds 4.1 dm. (1.5+2.6) long and 6 cm. wide represent 
average luxuriance. Collected well fruited on June 26. The 
sterile fronds are half evergreen and in ‘‘rosettes”’ last well over 
‘ winter. 
EQUISETUM ARVENSE L. 
Common in about the frequency and usual great abundance 
for this general region. Fruits in early spring. (April 13, 1907, 
149.) Herbaceous. 
EQUISETUM FLUVIATILE L. 
Occurs in great abundance often in patches of practically 
pure association, in wet situations in the low meadows along the 
Little Lehigh, from opposite toth Street, Allentown, westward 
as far as 12th Street (May 30, 1900, Dowell 799), and at the mouth 
of Cedar Creek (E..S. Mattern). Alsoshores of the Lehigh River, 
near Slatington (Krout),and 114 miles east by southeast of Allen- 
townalong the canal (October 3,1909). Fruiting plants 8.2 dm. 
and sterile plants 9.5 dm. high represent average luxuriance at the 
first named station, where the plants grow in the open and fruit 
‘abundantly in May ( May 28, 1909, 1849). Herbaceous, withering 
early. 
EQUISETUM HYEMALE L. 
Not infrequent in woods along the Jordan Creek and Little 
Lehigh River. Also at Coplay (Krout) and in abundance within 
a limited area between the canal and the Lehigh River, approxi- 
mately 2 miles east of Allentown (December 5, 1908.) I m. in 
height at this station but lower elsewhere. Collected fruiting 
in fall (14 mile west of Jordan Bridge, October 6, 1901, Dowell 
1329) but not in early spring. Evergreen. 
