ONOCLEA SENSIBILIS, Linn^us. 
Sensitive Fern. 
Onoclea SENSIBILIS: — Root-stock creeping, elongated; 
stalks scattered, nearly chaffless, a few inches to over a foot 
high ; fronds dimorphous ; sterile ones triangular-ovate, folia- 
ceous, smooth, quickly withering when plucked, deeply pin- 
natifid into several oblong-lanceolate entire or sinuate or 
sinuately pinnatifid segments, the lowest pair sometimes dis- 
tinct, the rest connected by a wing which widens upwards ; 
the veins reticulated and forming narrow paracostal areoles, 
and, outside of these, copious oblong or hexagonal meshes ; 
fertile fronds shorter, contracted, rigid, closely bipinnate ; the 
pinnules rolled up into berry-like bodies ; veins free, simple 
or forked, soriferous on the back ; sporangia borne on an 
elevated receptacle, half surrounded by a very delicate some- 
what hood-like indusium attached at the base of the receptacle. 
Onoclea sensibilis, Linna;us, Sp. PL, p. 1517. — Michaux, FI. Bor. -Am., 
ii., p. 272. — Swartz, Syn. Fil, p. no. — Sciikuhr, Krypt. 
Gew., p. 95, t. 102. — WiLLDENOw, Sp. PL, V., p. 287. — PURSH, 
FI. Am. Sept., ii., p. 665. — Hooker, Gen. FiL, t. Ixxxii ; FI. 
Bor.-Am., ii., p. 262; Sp. Fil., iii., p. 160. — Torrey, FI. New 
York, ii., p. 499. — Gray, Manual, ed. i., p. 457; ed. ii., p. 599, 
t. xii ; ed. v., p. 668, t. xviii ; Botany of Japan, in Mem. Amer. 
