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 (Canbj^'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 Gratiolece, it may possibly be- 

 long to the Vej-onicece, 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 Raflnesque. 



Ilysanthes Raf., Ann. Nat. 13. 1820. 



Type species, 7. riparia Raf., of the banks of the Ohio. 



Stem erect or ascending. Leaf-blades more or less elongate, the 

 lower ones narrowed at the base. 

 Pedicels stout, shorter than the subtending bracts. Sepals usually 



as long as the capsule. 1. I. duhia. 



Pedicels filiform, longer than the subtending bracts. Sepals 

 shorter than the capsule. 

 Upper leaves or bracts but slightly smaller than the lower. 

 Pedicels erect or ascending (or in fruit rarely slightly re- 

 flexed). Leaves mainly cauline. 

 Stem-leaves partially clasping, all opposite, none of the leaves 

 obviously punctate. Sepals decidedly shorter than the 

 capsules. 2. I. inaequalis. 



Stem-leaves sessile or narrowed at base, frequently in threes, 

 the leaves all evidently glandular-punctate. Sepals 

 scarcely shorter than the capsule. 3. I. saxicoJa. 



Upper leaves or bracts reduced to scales. Pedicels conspicu- 

 ously reflexed in fruit. Leaves mainly basal. 



4. I. rejrada. 

 Stem repent or prostrate throughout. Leaf-blades orbicular or ovate- 

 orbicular, rounded at the base and closely sessile. 



5. I. grandiflora. 

 1. Ilysanthes dubia (L.) Barnhart. 



Gratiola duhia 'L.,^\).'P\.\7. 1753. "Habitat in Virginiae aquosis. . . . 

 Gron. vii-g. 129." Type, Clayton 164, identified by Dr. B. L. Robinson 

 in Rhodora 10: 67. 1908. as the species here considered. 



Capraria gralioloides L., Syst. ed. X. 1117. 1759. Based upon Graliola 

 duhia L. 



Gratiola tetragona Ell., Sketch Bot. S. C. and Ga. 1: 15. 1816. "Growsin 

 ponds and ditches four miles from Charleston [South Carolina]." Type 

 seen in the Elliott Herbarium at the Charleston Museum. 



Lindernia attenuata Muhl.; Ell., 1. c. 17. 1816. "Grows in wet places. 

 Vail' Ombrosa, Ogechee, Georgia. Type seen in the Elliott Herbarium 

 at the Charleston Mu.seum. Isotype in Herb. Columbia University at 

 the New York Botanical Garden. 

 • Ilysanthes dubia (L.) Barnhart, Bull. Torr. Bot. Club 26: 376. 1899. 



