ORCHIDACEAE 381 
1. I. Beckii (Lindl.) House. Stem 1-3 dm. tall, from a single root (the pre- 
ceding season’s ean sometimes Pura E blades of the basal leaves ovate 
elliptic, a 3 em. lon rae spike very slen 
der, relatively p -flowered : perianth 
white: lateral sepals juod about 3 
long: petals spatulate to elliptie- 
spatulate: E ovate to orbicular-ovate, 
E [Spiranthes simplex 
ae cid soil, often in open 
oa Tuastal Plain à nd adj. provinces, 
Fla. to Tex., Ark., and ps Sum. 
2. I. floridanum Wherry. Stem 1.5-4 
dm. tall, from a eluster of fleshy roots: 
blades of the basal leaves elliptie Or 
Pub re so, 1-4 em. long: spike iiu 
em. long: pe erianth whitish or c 
colored, with a bright yellow stripe a 
iddle of the lip: cd. sepals lanceolate, 4-5 mm. long: petals linear: 
lin elliptie- -oblong, about as long as the us — Moist, enone acid pinelands 
and boggy meadows, RUE Plain, Fla. to E and S. C.—Spr. 
9. I. gracile (Bigel) House. Stem 2-8 dm. tall, from a cluster Gi short roots: 
blades of the basal leaves elliptie or ovate-lanceolate, 1.5-5 em. long: T ike 
slender, as em. long: perianth white, with a bright ipm D down 
middle of the lip: lateral sepals lanceolate, 4—4.5 m ong: petals linear: im 
re ae oblong, slightly longer than the sepals Dry, a acid d 
an woods, various dip Ga. to Tex., Man., and N. S.—Sum 
4. I. longilabre (Lindl) H from usually 3 -— 
roots: ole of the basal ie mn p: Mines M n 2-5 em. long: 
spike stout: perianth mainly white: lateral sepals Ei i r linear- lanceolat ate 
from a Ru base: petals broadly linear or nearly s ToN elliptic-ovate, 
7-9 mm. long, much erisped above the base, faa pics : [ Spiran- 
thes qeu Chapm. | —Moist grassy pinelands, Coastal Pla. Fla to La.— Fall. 
5. I. tortile (Sw.) House. Stem 2-4.5 dm. e from a cluster of long roots: 
blades of the basal and lower cauline leaves elongate-linear or filiform-linear, 
very thick, mostl em. long: spike tun pe slender: perianth mainly 
S: ads sepals broadly lanceolate, 4.5-5.5 mm. long: petals narrowly ellip- 
tic: lip ovate, mm. long.—Marshes and moist a. Coastal Plain, Fla. 
to La EW., I.)—Spr.-fall. 
I. laciniatum (Small) House. Stem 2-6 dm. tall, from a cluster of coarse 
de roots, more or less pubescent: blades of the basal and lower cauline 
leaves DER linear and often long- tapering, up to 40 em. long: spike slender, 
elongate: perianth white or nearly so, 7-9 mm. long: lateral sepals linear- 
ely 
ex.—Wet sandy soil, marshes, ponds, and lake shores, often in acid 
soil, Coastal Plain, Fla. to Tex. and S. C.—Spr.-sum. 
7. I. vernale (Engelm. & Gray) House. Stem 1.5-6.5 dm. tall, from elongate- 
fusiform roots, eet pubescent above: blades of the basal and lower cauline 
leaves linear, tapering to both ends, or sometimes phyllode-like and without a 
dilated blade, 7-15 em. inne bd elongate: perianth yellowish: lateral ae 
lanceolate, 6-10 mm. long: petals linear or elliptic-linear: lip ovate, presa 
rhombie-ovate. [I. Exo eie ups ae —Sa a or gravelly hs meadow 
po and open woods, various provinees, Fla. . M., Kans., and Mass.— 
in .)—Spr.-fal. Hybridizes with J. pros um: dr intermedium | 
I. praecox (Walt.) House. Stem 2-8 dm. tall, from clustered elongate pm 
is ingly pubescent above: blades of the ba sal and lower cauline leaves linear, 
cece narrowly so, 8—25 em. long: spike elongate, slender, hm very dense: perianth 
