182 SEVENTEENTH REPORT. 



{Sphenopholis palustris, Scribn. and allied species will be better taken ; 



care of if allowed to remain in Trisetum). • 



Reboulea obtusata var. lobata (Trin.) N. Comb. \ 

 Trisetum lobatum Trin. in Mem. Acad. Petersb. Ser. 6, 1, 66, 1831. 



Reboulea filiformis (Chapm.) N. Comb. I 



Ealonia Pennsylvanica var. filiformis Chapm. Fl. S. St. 560, 1860. .^ 



Reboulea pallens var. longiflora (Vasey) N. Comb. , 



Eaton in tongi flora (Vasey) Beal, Grasses N. Am. 2, 494, 1896. ; 



Reboulea pallens var. major (Torr.) N. Comb. ■ 



Koeleria tunicata var. major Torr. Fl. N. & M. U. S. 117, 1824. ■ 



Eragrostis capillaris var. Frankii (Steud.) N. Comb. i 



Eragrostis Frankii Steud. Syn. PI. Gram. 273, 1855. i 

 More robust and more freely branched than in the species, with 



shorter panicle branches. . 

 Eragrostis Eragrostis var. megastachya (Koeler) N. Comb. 



Eragrostis vulgaris a megastachya Coss u Germ. Fl. Paris 2. 641, 1845. \ 



Eragrastis pilosa var. Caroliniana (Spr.) N. Comb. i 



Poa Caroli7iianaSpT. Fl. Hal. Mant. 33, 1807. ' 



Eragrastis Purshii Schrad. Linnaea, 12, 451, 1838. ■ 



Potamogeton gramineus Lin. Sp. PI. 1, 27, 1753. ' 



Potamogeton gramineus A graminifolius Fries. Nov. Fl. Suec. 36, ; 



1828 and a fluvialis 1. c. 37. 



Floating and submerged leaves alike, sessile or subsessile. 



Potamogeton gramineus var. lacustris (Fries) N. Comb. ' 



Potamogeton gramineus A graminifolius h laaistris Fries 1. c. 37. | 



Similar to the next but the floating leaves are membranaceous, not | 



coriaceus. 



Potamogeton gramineus var. parvifolius (Nolte) N. Comb. i 



Potamogeton heterophylhis var. parvifolius Nolte in Wallr. Shed. 1822,. | 



ex Fries, 1. c. • j 



Potamogeton gramineus B heterophyllus and d stagnalis Fries 1. c. i 

 Potamogeton heterophjllus Wallr. Sched. Crit. 1, 64, 1822 and Amer. 



Authors not Schreb according to Fries. 



Floating leaves coriaceous, petioled, elliptic, ovate, rounded at base, 



shorter and broader than the submersed leaves. 



Eriocaulon aquaticum (Hill) G. C. Druce Pharm. Journ. 29, 700,. ] 



1909, should be adopted for E. septangulare, With. I 



