316 



OKCHIDACEAE (OKCHIS FAMILY) 



10. LISTERA R. Br. Twayblade 



Sepals and petals nearly alike, spreading or reflexed ; lip mostly drooping, 

 longer than the sepals, 2-lobed or 2-cleft at the summit. Column wingless. 

 Stio-ma with a rounded beak ; anther borne on the back of the column at the 

 summit, erect, ovate ; pollen powdery, in two masses, joined to a minute gland. 



Roots fibrous. Stem bearing in the middle a pair of nearly opposite sessile 



leaves. The small flowers greenish or madder-purple in a terminal raceme. 

 (Dedicated to 3Iartin Lister, 1638-1711, a celebrated English naturalist.) 

 * Column very short (0.5 mm. or less) ; Up not dilated above. 

 ■*- Lip with a tooth on each side at base ; raceme glabrous. 

 1. L. cordata (L.) E. Br. Leaves round-ovate, somewhat heart-shaped, 

 12-25 mm. long ; stem pubescent just above the leaves ; flowers about 3 mm. 

 across, on pedicels not longer than the ovary ; lip narrowly oblong, 

 2-cleft. — Mossy woods and swamps, Lab. to N. J., w. to Mich., 

 Col., and Cal., north w. to the Arctic coast. (Greenl., Iceland, 

 Eu., and Japan.) Fig. 630. 



H- -f- Lip not toothed at base ; raceme glandular. 



2. L. australis Lindl. Leaves ovate ; raceme loose and slen- 

 der ; flowers small, on minutely glandular-pubescent pedicels which 

 equal or exceed the glabrous ovaries; lip linear, 6-10 mm. long, 

 cleft one third to two thirds the w^ay down into linear-setaceous divisions. — 

 Shady woods, La. and Fla. to N. Jo ; Oswego Co., N. Y. ; Ottawa, Ont. 



* * Column 2-3 mm. long. 



•«- Lip auriculate at base, more or less ciliate, 



3. L. auriculata Wiegand. Leaves elliptic-oval or elliptic-ovate, 35-50 mm. 

 long, inserted above the middle of the stem ; flowers numerous, in a loose raceme ; 

 rhachis pubescent ; pedicels glabrous, mostly shorter than the 

 glabrous ovaries ; lip 6-8 mm. long, slightly ciliate, oblong, cleft 

 one third to one fourth of its length, auricles incurved. — Cedar 

 swamps and mossy banks, e. Que. to n. N. Ho and m Vt. 

 i'lG. 631. 



-«- -I- Lip not auriculate at base. 



4-f Ovary glandular. 



4. L. convallarioides (Sw\) Torr. Leaves oval or roundish and sometimes 

 slightly heart-shaped, 3-5 cm. long ; raceme many-flowered, loose ; rhachis 

 densely glandular-pubescent ; pedicels glandular, slightly longer than the ovaries ; 



lip 9-11 mm. long, ciliate on the margin, narrowly cuneate, 

 retuse, lobes rounded, on each side of base a short triangular 

 tooth. — Moist woods, Nfd, to n. N. E., Mich., and the Rocky 

 Mts., westw. and north w. Fig. 632. 



++ ** Ovary glabrous. 



5. L. Smdllii Wiegand. Leaves borne at or below the middle 

 of the stem, 15-25 mm. long, ovate-reniform, mucronate, often 

 apiculate ; raceme loose, few-flowered ; rhachis glandular ; pedicels glabrous, 

 equaling or exceeding the ovaries in length ; lip 9 mm. long, not ciliate, broadly 

 obovate, cleft at the apex, on each side of base a curved oblong obtuse tooth. — 

 Daiip woods in the mts.. Pa. to N. C. (E. Asia.) 



L. auriculata 



632. L. convalla- 

 rioides X 1. 



11. CORALLORRHIZA [Haller] R= Br. Coral Root 



Perianth somewhat ringent, gibbous or obscurely spurred at base. Sepals 

 and petals oblong-lanceolate, nearly alike, l-.3-nerved ; lateral sepals ascending, 

 forming with the lip the gibbosity or short spur which is mostly adnate to the 



