320 ORCHIDACEAE 



2-2.5 cm. long, acute or somewhat acuminate, entire, rounded at the base, those of the 

 stem reduced to sheathing scales : petioles as long as the blades or shorter : spike 

 2-4 cm. long, about 12-flowered : bracts lanceolate, acuminate, less than 1 cm. long : per- 

 ianth 3-4 mm. long, surpassing the bracts: lateral sepals obliquely lanceolate, about 3.5 

 mm. long, acutish : lip about 4 mm. long, the tip cuneate, not crisped, drooping, the base 

 oval : column f as long as the lip : anther ovate. \_Spiranthes Storeri Chapm. ] 

 On decaying vegetable matter in hammocks, near Enterprise, Florida. Spring. 



13. STENORHYNCHUS L. C. Rich. 



Terrestrial herbs, with pale foliage. Stems leafy, or scaly, often stout. Leaves short 

 or elongated, sheathing at the base, the lower ones early disappearing. Flowers perfect, in 

 a large terminal spike. Bracts narrow, acuminate. Perianth white or pale. Sepals and 

 petals narrow, decurrent on the ovary, forming a stout beak. Lateral sepals nearly free, 

 the middle sepal adnate to the lateral petals. Lip erect, with a broad claw-like base and 

 broad blade, destitute of callosities. Anther adnate to the back of the column, persistent. 

 Pollen-mass 1 in each sac. Capsules erect, beaked on one side. 



1. Stenprhynchus Jaliscanum (S. Wats.) Nash. Hoots several, coarse, in a dense 

 cluster. Foliage yellowish white : leaves mostly basal, those of the stem sheathing scales 

 2-4 cm. long : stems 3-7 dm. tall : bracts shorter than the flowers, acuminate : spike 5-20 

 cm. long, 4-6 cm. thick : perianth yellowish white : sepals and lateral petals 1.5-2 cm. 

 long, acute or acuminate : lip slightly shorter than the sepals or petals, the claw-like l>;isc 

 obcuneate, densely pubescent along the edges, the blade triangular-lanceolate, acute, about as 

 long as the base : capsules about 1.5 cm. long. [Spiranthes Joliscana S. Wats.] 



In hammocks, peninsular Florida, and .in Mexico. Spring. 



14. PHYSURUS L. C. Rich. 



Terrestrial herbs, with leafy stems. Leaves alternate : blades often membraneous, 

 sometimes blotched. Flowers in terminal spikes, or spike-like racemes, with small bracts. 

 Perianth inconspicuous. Sepals nearly equal, distinct, the 2 lateral spreading, the mid- 

 dle one erect. Lateral petals converging with the middle sepal or coherent with it. Lip 

 dilated above, concave and prolonged into a spur at the base, sessile. Column very short. 

 Anther erect on the column, conic. Pollen-masses 2, powdery, entire. Capsules erect. 



1. Physurus querceticola Lindl. Plants succulent: stems 1-3 dm. tall, leafy to the 

 top : leaf-blades lanceolate to ovate-lanceolate or ovate, 1-6 cm. long, acute or obtuse on 

 the lower part of the stem, rounded or truncate at the base ; petioles 5-10 mm. long, di- 

 lated into sheathing bases : upper leaf [or two reduced to sheathing scales : raceme 1-5 cm. 

 long : bracts ovate-lanceolate, shorter than the flowers : perianth-members 3.5-4 mm. long : 

 lateral sepals linear or linear-lanceolate : lip with a dilated suborbicular dish-like claw and 

 an orbicular-obovate blade, this notched or truncate and tipped by a drooping or recurved 

 triangular tip : spur pouch-like, shorter than the ovary. 



In shady pine lands, Florida and Louisiana. Spring to fall. 



15. LISTERA R. Br. 



Delicate herbs, with fleshy-fibrous roots. Leaves reduced to scales at the base of the 

 stem and 2 opposite ones higher up (the latter perhaps more properly regarded as bracts 

 subtending the inflorescence). Flowers in terminal racemes. Perianth inconspicuous. 

 Sepals and lateral petals distinct, rather similar, reflexed. Lip erect or drooping, notched 

 or sometimes elongated and deeply cleft. Anther erect, jointed to the back of the column, 

 without a lid. Column wingless. Pollen-masses, 2 powdery, united to a minute gland. 

 Capsules pedicelled, erect or drooping. TWIFOLE. Tw AY-BLADE. 



Lip wedge-shaped, about twice as long as the petals, notched at the apex : column 1.5 mm. long. 



1. L. Smallii. 

 Lip linear, 6-10 times longer than the petals, 2-parted : column 0.5 mm. long. 2. L. australis. 



1. Listera Smallii Wiegand. Foliage deep green. Stem 1-3 dm. tall, slender, 

 glabrous or nearly so below, densely glandular-pubescent above : leaves 2, opposite, about 

 the middle of the stem ; blades reniform or ovate-reniform, 1-3 cm. in diameter, apiculate 

 or short-acuminate, glabrous above, more or less pubescent beneath, cordate or subcordate, 

 sessile : racemes 2-10 cm. long : perianth greenish : bracts lanceolate or ovate-lanceolate, 

 3-5 mm. long, acute : pedicels slender, 4-7 mm. long, glabrate, or much less pubescent 



