116 MISSOURI BOTANICAL GARDEN. 
lateral wing, and with 2 pairs of subepidermal resin pas- 
sages; fruiting head small, 6 mm. in diameter; flowers 
white, 12 to 14 mm. across. Only 1 or 2 flowers fertile. 
Growing in tufts at the nodes of very slender stolons, in 
water 3 to 10cm. deep. Collected at Eustis, Lake Co., 
Florida, March 22, 1894, by Geo. V. Nash, and by A. S. 
Hitchcock in July. It is common along the sandy lake 
margins and forms quite extensive patches in the shallow 
water, its slender interlacing stolons bearing tufts of leaves, 
and rooting at the nodes. It is more closely related to S. 
graminea, Michx. than to any other species. In the arti- 
ficial key to the genus it should be inserted after S. macro- 
carpa, from which it is easily separated by the smaller 
achenium. The type is in the Herbarium of the Missouri 
Botanical Garden.— Plate 53. 
ERAGROSTIS SPOROBOLOIDES, Smith and Bush, n. sp. 
Tall perennial; culms 5 to 7 dm. high, erect, simple or 
branching from the base; sheaths longer than the inter- 
nodes, pilose, especially at the throat; leaves soft, flat, 
becoming involute and filiform above, 5 to 8 mm. wide, 4 
to 6 dm. long, scabrous on the upper surface, smooth 
below; panicle oblong, not emergent from the upper 
sheath, half as long as the culm; branches of the panicle 
capillary, single or in pairs, minutely scabrous; spikelets 
2.5 mm. long, 2 or 3 flowered, on scabrous capillary ped- 
icels 1 to 3 cm. long; empty glumes one-nerved, ovate- 
lanceolate, acute, scabrous on the keel, two-thirds as long 
as the lowest floret ; flowering glume ovate, acute, 3-nerved, 
the nerves scabrous above; caryopsis not seen. Collected 
at Sapulpa, Indian Territory, July, 1894, by B. F. Bush. 
This grass is closely related to Hragrostis capillaris, Nees, 
but is perennial, and has much longer and wider leaves. 
Immature specimens appear at first sight only one-flowered, 
and might be mistaken for excessively long leaved forms 
of Sporobolus asperifolius Thurb., a resemblance which is 
heightened by the very pilose sheaths; hence the specific 
