OKCHIDACEAE 319 



Lip of an oblong or quadrate type, the callosities small, often imbedded in 



the lip-base: median sepal obtuse. 



Lip oblong, pubescent without: petals oblong. 11. 7. trilobum. 



Lip quadrate, glabrous: petals linear. 12. /. plantagineum. 



1. Ibidium Bckii (Lindl.) House. Stem 1-3 dm. tall, from a single root: 

 blades of the basal leaves ovate or oblong, 1-3 cm. long, early decaying: perianth 

 white: lateral sepals lanceolate, about 3 mm. long: petals broadly spatulate or oblong- 

 spatulate: lip ovate to orbicular-ovate, 2.5-3 mm. long, the callosities directed 

 backward. [Gyrostachys simplex (A. Gray) Kuntze.] 



In dry soil, Massachusetts to Florida and Texas, and in the Mississippi Valley to Ken- 

 tucky and Arkansas. Summer and fall. 



2. Ibidium gracile (Bigel.) House. Stem 2-6 dm. tall, from a cluster of short 

 roots: blades of the basal leaves oblong, elliptic or ovate-lanceolate, 1.5-5 cm. long, 

 early decaying: perianth white and green: lateral sepals lanceolate, 4-4.5 mm. long: 

 petals linear: lip oblong, 4-4.5 mm. long, the callosities more or less spreading. 



In woods and on banks, Nova Scotia to Manitoba, Florida and Texas. Summer and fall. 



3. Ibidium longilabris (Lindl.) House. Stem 2-4 dm. tall: blades of the 

 basal leaves lanceolate to oblong-lanceolate, 2-5 cm. long, early decaying: perianth 

 mainly white: lateral sepals lanceolate or linear-lanceolate from a dilated base, 5-7 

 mm. long: petals broadly linear or nearly so, straight: lip ovate or oblong-ovate, 7-8 

 mm. long, much crisped above the base, the callosities stout. [Gyrostachys brevifolia 

 (Chapm.) Kuntze.] 



In moist pine lands, Florida to Louisiana. Fall to spring. 



4. Ibidium tortile (Sw.) House. Stem 2-4.5 dm. tall, from a cluster of rather 

 long roots: blades of the basal leaves narrowly linear, 8-30 cm. long, very thick: 

 perianth mainly white: lateral sepals broadly lanceolate, 4,5-5.5 mm. long: petals 

 oblong or nearly so: lip ovate, 4-6 mm. long, the callosities short and stout. 



In wet or moist soil, southern peninsular Florida. Winter and spring. 



5. Ibidium vernale (Engelm. & Gray) House. Stem 1.5-5.6 dm. tall: blades 

 of the lower cauline leaves elongated, linear, sometimes broadly so, 7-15 cm. long: 

 perianth mostly yellowish: lateral sepals lanceolate, 6-10 mm. long: petals linear or 

 linear-oblong: lip ovate, sometimes narrowly so, 6-8 mm. long, the callosities incurved. 

 [Gyrostachys linearis Eydb.] 



In sandy or gravelly soil, Massachusetts to Florida and New Mexico ; also in the Mis- 

 sissippi Valley to Illinois and Kansas. Summer and fall. 



6. Ibidium xyridif olium Small. Stem 2-15 dm. tall, conspicuously leafy : 

 blades of the lower cauline leaves short, linear-attenuate, 5-10 cm. long: perianth 

 whitish: lateral sepals lanceolate, 57 mm. long: petals broadly linear: lip ovate or 

 rhombic-ovate in outline, 6-8 mm. long, the callosities straight. [^Gyrostachys 

 Reverchonii Small.] 



In moist grounds, Georgia and Florida to Texas. Also in Bermuda. Spring. 



7. Ibidium laciniatum (Small) House. Stem 2-5.5 dm. tall, not conspicuously 

 leafy: blades of the lower cauline leaves elongated, narrowly linear, 10-40 cm. long: 

 perianth whitish: lateral sepals linear-lanceolate, 6-8 mm. long: petals linear: lip 

 oblong-ovate, 7-9 mm. long, finely laciniate near the tip, the slender callosities in- 

 curved. 



In wet sandy soil, Georgia and Florida to Texas. Spring. 



8. Ibidium praecox (Walt.) House. Stem 2-8 dm. tall: blades of the lower 

 cauline leaves elongated, linear or nearly so, 530 cm. long: perianth white: lateral 

 sepals lanceolate or linear-lanceolate, 5-7 mm. long: petals linear: lip oblong, 5-7 

 mm. long, the callosities straight. 



In grassy places, New York to Florida and Texas. Summer. 



9. Ibidium ovale (Lindl.) House. Stem 2-4 dm. tall, rather leafy: blades of 

 the lower cauline leaves broadly linear to linear-oblong, 4-16 cm. long: perianth 

 white: lateral sepals broadly lanceolate, 4-5 mm. long: petals broadly linear or linear- 

 lanceolate: lip ovate or oblong-ovate, 4-5 mm. long, narrow at the apex, the cal- 

 losities somewhat incurved. [Gyrotachys paryiflora (Chapm.) Small.] 



In woods and swamps, Ohio to Missouri, Georgia %jad Louisiana. Fall. 



