1919. ]} NATURAL SCIENCES OF PHILADELPHIA. 245 
Apparently this plant only flourishes during wet seasons. On 
April 25, 1917, I searched most carefully for it on the summit and 
slopes of Stone Mountain (Canby’s record of May 15, 1869, specifies 
“the summit’’), but found no trace whatever. The season had been 
dry and there were no pools. 
A remarkable plant with a unique dimorphic habit. It should be 
carefully studied living in order to assist in discovering its real 
relationship. Certainly aberrant in Gratiolew, it may possibly be- 
long to the Veronicea, as is suggested by the fruit. This was long 
ago the thought of Dr. Leavenworth as shown by his notes preserved 
in the herbarium of Columbia University. 
13. ILYSANTHES Rafinesque. 
Ilysanthes Raf., Ann. Nat. 13. 1820. 
Type species, J. riparia Raf., of the banks of the Ohio. 
Stem erect or ascending. Leaf-blades more or less elongate, the 
lower s narrowed at the base. 
Pedicels stout, shorter - the subtending bracts. eee aged 
as long as the cap a. 
Pedicels filiform, el ‘than the subtending iraaia:  Bepale 
shorter than the capsu 
Upper leaves or bracts bat: slightly smaller than the lower. 
hese erect or ascending Se in fruit rarely slightly re- 
eaves mainly caulin 
Siraj ieee vartially clasping, all opposite, none of the leaves 
sha punctate. Sepals decidedly saa than the 
capsules. naequalis. 
Stem-leaves sessile or narrowed at base, Stet oe in threes, 
the leaves all evidently glandular-punetate. _ Sepals 
scarcely shorter than the capsule. 
Upper leaves or bracts reduced to scales. Padioge nek: 
ously reflexed in fruit. Leaves mainly bas gee oe 
: a. 
Stem repent or prostrate throughout. Leaf-blades reader or ovate- 
orbicular, rounded at the base and closely sessile. 
5. I. grandiflora. 
1. Ilysanthes dubia (L.) Barnhart. © a 
] ia L. _PL17. 1753. “Habitat in Virginiae ae 
"Gree ges iio) Bee Clayton 164, identified a F Dr. B. L. Robinson 
Gratiola tetragona Ell., Sketch Bot. 8. C.andGa. 1:15. 1816. “Growsi in 
ponds and ditches four miles from Charleston [South Carolina].”” Type 
ar seum. 
Ell, 1. c. 17. 1816. ‘Grows in wet. places. 
Vall ‘Onbeon, Ogechee, Georgia. Type seen in the Elhott Herbarium 
at the Charleston Museum. Isotype in Herb. Columbia le herr at 
the New York Botanical Garden 
Piganithes dubia (L.) Barnhart, Buil. Torr. Bot. Club 26: 376. 1899. 
