1918] Fernald,— An intergeneric Hybrid 191 
adscendentibus castaneis anguste lineari-cylindricis 0.5-1 cm. longis; 
squamis 20—40 densissime spiraliter imbricatis castaneis membranaceis 
oblongis 1.5-2 mm. longis subcarinatis breviter aristatis; floribus 
sparsissimis plerumque nullis; spiculis secondariis ut apud Ryncho- 
sporam minutis; perianthiis nullis; achenio abortivo minuto, stylo 
2-partito, tuberculo subulato. 
Habit as in Rynchospora capitellata; culms cespitose, 3-4.8 dm. 
high, slender and smooth: leaves somewhat leathery; the basal 
narrowly linear, elongate; the cauline 5-7, greatly reduced: corymbs 
somewhat umbelliform, terminal and axillary; the terminal 1.3-2 cm. 
in diameter: spikelets crowded, strongly ascending, chestnut-brown, 
slenderly linear-cylindric, 0.5-1 cm. long: scales 20—40, very densely 
spirally imbricated, chestnut-brown, membranaceous, oblong, 1.5-2 
mm. long, somewhat keeled, short-awned: flowers very scarce, mostly 
wanting: secondary spikelets as in Rynchospora, minute: perianth 
wanting: achene aborted, minute; style 2-parted; tubercle subulate. 
— Massacuuserts: sandy shore of Simmons Pond, Dennis, Sep- 
tember 30, 1915, C. A. Weatherby (TYPE in herb. New England Botani- 
cal Club), and collected apparently from the same clump, August 22, 
1918, Fernald & Long, no. 16,287. PLATE 125. 
GRAY HERBARIUM. 
EXPLANATION OF PLATE 125. 
Fig. 1. XCyperus Weatherbianus, portion of clump X 4. 
Fig. 2. i ” terminal corymb X 1. 
Fig. 3. s p spikelet X 2. 
Fig. 4. T i scale X 6. 
Fig. 5 py s denuded rhachilla, showing secondary 
spikelets X 15. 
Fig. 6. Cyperus dentatus, spikelet X 2. 
Fig. 7. Rynchospora capitellata, spikelet X 2. 
FURTHER NOTES ON POTAMOGETON. 
Harotp St. JOHN. 
Potamogeton vaginatus Turcz. is represented in the Herbarium at 
the Jardin des Plantes, Paris, by a suite of specimens with abundant 
fruiting spikes. These show that in spite of the phrasing of the 
original description! and of the colored representation in Fryer’s 
1 Turcz. Bull. Soc. Nat. Moscou, xi. 102 (1838), xxvii. 65 (1854), Fl. Baical.-Dahur. ii. 162 
(1856). 
