86 ROCHESTER ACADEMY OF SCIENCE 8. RHYNCHOSPORA Vahl Beak-rush a. Plant tufted; culms stout, 1-8 dm. high, leaves setaceous to linear, 0.5-2.5 mm. wide; inflorescence of turbinate fascicles, at first milky-white, whitish-brown when mature . .. .. .. .................................... 1. R. alba. a. Plant fo rming tussocks; culms capillary, 0.5-4.5 dm. high, leaves setaceous or nar­ rowly linear; inflorescence of small fascicles with 1-10 spikelets, brown. b. Bristles retrorsey barbed ... .... .. 2. R. capillacea. b. Bristles smooth, not barbed .......... 3. R. capillacea forma leviseta. 1. Rhynchospora alba (L) Vahl \"HITE BEAK-RUSH . R. a.lba. Vahl of Proc. Roch. Acad. Sci. 3: 117. 1896. Open sphagnum bogs. Infrequent. Bergen Swamp, Kennedy's bog at Mendon Ponds Park, IVlud Pond in Wayne Co ., and Junius Ponds in Seneca Co. are stations where this species occurs more or less abundantly. 2. Rhynchospora capillacea Torr. CAPILLARY BEAK-RUSH. Marly bogs. Infrequent. Open marl bog in Bergen Swamp, marl bog at Junius Ponds in Seneca Co., marl bog north of Quaker Pond in Mendon Ponds Park, Cedar Swamp in town of Henrietta and a marl bog on the Victor Road near Victor in Ontario Co. are stations where this species has been found in limited quantities, usually with Scleria verticillata. 3. Rhynchospora capillacea Torr. forma leviseta (E. J. Hill) Fern. Marly bogs. Rare. The open marl bog in Bergen Swamp is the only known station for this form in the area. 9. CLADIUM P. Br. Twig-rush 1. Cladium mariscoides (Muhl.) Torr. C. ma.yiscoides Torr. of Proc. Roch. Acad. Sci. 3: 117. 1896. Marshes bordering ponds and streams. Infrequent. Bergen Swamp, marshy borders of Quaker Pond in Mendon Ponds Park, Junius Ponds in Seneca Co. and Mud Pond in Wayne Co. are stations for this species. 10. SCLERIA Bergius Nut-rush a. Achenes smooth, ovoid, about 3 mm. long including the basal disk 1. S. triglomerata. a. Achenes not smooth, globOse, 1.5--2 mm. long. b. Culms, leaves and scales, densely pubescent 2. S. pauciftora var. caroliniana. b. Culms, leaves and scales, essentially glabrous ....... .. 3. S. verticillata. 1. Scleria triglomerata Michx. T ALL NUT-GRASS, WHIP GRASS. Moist thickets. Rare. Moist roadside thicket at Sullivan's Swamp near Fishers in Ontario Co., August 15, 1926, M. S. Baxter; and Mud Pond in Wayne Co., July 2, 1916, E. P. Killip are the only records for this species. .