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3. Hexalectris. Flower not gibbous, and lip with 5 or 6ridges: sepals and petals 
several-nerved. 
** Anthers erect upon the back of the column at summit, or terminal and opercular; 
pollinia granular or powdery, more or less colieving in 2 to 4 delicate masses and 
attached at apex to the beak of the stigma, 
+ Anthers without operculum: flowers smnall, in spikes: pollinia 2, 
4. Gyrostachys. Stem leafy below froin tuberous-fascicled roots: flowers 1 to 
3-ranked in a twisted spike. 
++ Anthers operculate. 
5. Peramium. Stem stout, very leafy: flowers racemose, 
6. Cathea. Stem scapose: leaf solitary, grass-like: flowers large: pollinia 4. 
* * * Anthers without operculum, the cells adnate to the top of the column; pol- 
linia 2, of coarse grains united by an elastic web, each attached at base by astalk 
to a viseid gland. , 
7. Habenaria. Glands naked, either approximate or widely separate: flowers 
ringent and spurred, spicate upon a leafy stem. 
1. ACHROANTHES Raf. (ADDER’S-MOUTH.) 
Low bulbous simple-stemmed herbs, with solitary leaf, raceme of 
minute greenish flowers, spreading oblong sepals, spreading linear or 
filiform petals, the subentire non-tuberculate lip auricled or ovate at 
base, the very small round column with 2 teeth or auricles at summit 
and the crect anthers between them, and 4 waxy pollen-masses (2 to 
each cell in one row) cohering (without stalks, threads, or gland) by 
pairs at the apex. (Microstylis Nutt.) 
1 A.monophylla(Lindl.) Greene. Slender (1 to 1.5dm. high): leaf sheathing the 
base of the stem, ovate-elliptical: racemes spiked, long and slender; pedicels not 
longer than the flowers: lip truncate-3-lobed at summit, the middle lobe very small: 
pollinia sometimes only one in each cell, (Microstylis monophyllos Lindl, )—Eastern 
Texas, near Hockley, and Trinity River, 
2. CORALLORHIZA RK. Br. (CORAL-ROOT.) 
Brownish or yellowish herbs destitute of green foliage, with much- 
branched and coral-like rootstocks, solitary scape with membranaceous 
sheaths, simple raceme of small dull-colored flowers, the ascending 
3-nerved sepals and petals similar and nearly equal, but the lateral 
sepals oblique at base and either decurrent in a short spur adnate to 
the side of the ovary or gibbous above it, lip slightly adherent to the 
base of the 2-edged straightish column, and 4 pollinia obliquely ineum- 
bent. 
1, C. odontorhiza Nutt. Light brownor purplish: stems rather slender, bulbous- 
thickened at base (1.5 to 3 dm. high), 6 to 20-flowered: pedicels rather slender: 
perianth about 6 mm. long; lip entire or merely denticulate, thin, broadly ovate or 
obovate, abruptly contracted into a claw-like base, the lamelle a pair of short pro- 
jections; spur wholly adnate to summit of ovary: pod short oval (at first acute at 
base), 8 mm. long.—Eastern Texas, from Hockley to the Trinity. 
3. HEXALECTRIS Raf. 
Leafless plants, with the several-nerved nearly equal somewhat 
spreading sepals and petals free and neither gibbous nor spurred at 
base, the obovate lip with 5 or 6 prominent ridges down the middle 
