380 ORCHIDACEAE 
tic or Adi is oval, 4-13 em. long, or longer: raceme stout, glandular-pubescent, 
1 : 
6-21 em. long: br acts linear- dd ue 5-14 mm. long: median sepal oblon 
or elliptic] anceolate m long, 
obtuse; lateral sepals ovate, "5 5.5 mm. 
long, acutish: petals 5 long, 
the blades about as wide as long: lip 
white with green stripes, E 
ther adly linea [ P. ndulosa 
(Sim r.|—Ric 00 asta 
R. ds, Coa 
Plain and occasionally adj. provinces, Fla. 
to Ala. and Va.—Fall.—spr. 
2. P. Brittonae Ames. Plant similar 
Me that E P. racemosa, but smaller 
r : lea 
with & more : 
SPEM elliptic, pie. Ad dada. 9-11 
em. long, acute: dc. . long: 
bracts oe ere ae 4—8 long: 
RAM sepal elliptic- Tes or ore 4—4.5 mm. long, obtuse; lateral sepals 
vate, 44.5 mm, long, acute: petals 44.5 mm. long, the blades decidedly longer 
than wide: lip 3-3.5 mm. lon ng: anther narrowly ellipsoid.— Pinelands and rarely 
hammoeks, Everglade Keys, Fla.—(W. I.)—Wint. 
22. IBIDIUM. Salisb. Caulescent herbs. Leaves various, the basal and 
lower cauline with usually narrow blades or sometimes with short broad blades, 
the upper eauline leaves mere sheathing scales. Flowers in a terminal spiral 
spike. Perianth white, rarely pinkish, done or greenish. Median sepal and 
petals coherent: lateral sepals erect. Lip erect, or with a spreading tip, bear- 
i asal callosities, the lower portion folded around the very short column 
ith a 2-forked beak. Capsule ascending. [Spiranthes L. C. Rich 
tigm 
ree Pers.]—About 80 species, natives of temperate and tropical Amer- 
ica.—LADIES’-TRESSES. PEARL-TWISTS. PIRAL-ORCHIDS.—A decoction from 
the roots of some of the species is used by the Seminoles as a blood purifier. 
Flowers merely alternate, apparently secund as a result of the twisting of the rachis. 
Stem Me oe scales: basal leaves with relatively short and broad blades, 
ip white A ANS perianth about E n lon ES I. Beckii. 
Lip medially colored: perianth 4—5 m 
Lip medially yellow: aoe rs o opening re spring. 2. I. floridanum. 
Lip medially green: flowers opening in summ 3. I. gracile. 
Spike merely secund, unilateral or md spirally 
isted : pd large Sis 11 mm. long 4, I. longilabre. 
SILIO and channeled. 5. I. tortile. 
Blades of the basal pepe narrowly linear, flat. 
Lip pubescent without. 
"Lib of an elliptic type, usually eee across 
the callosities. laciniate at the t 6. I. laciniatum. 
Lip of an ovate type, usually b Bes in front 
of the pane ae not laciniate at the tip. T7. I. vernale. 
Lip glabrous withou 8. I. praecoa. 
Flowers Pn al ranked, bor =e in an elongate, often dense 
spike, the rachis not conspicuously twisted. 
Lip white, pubescent, the callosities prominently exserted 
and more or less hoo oked. 
Perianth over 8 mm. lon ng, not conspicuously ringent, 
the parts not ee 9. I. cernuum. 
Perianth less than 4 m long, conspicuously ringent, 
the parts with COHSBIGHOHED. aa tips 10. I. ovale. 
Lip yellow, glabrous, the callosities imbedded. in the base 
of the blade. 11. I. plantagineum. 
