WILLOW FAMILY 65 



6. LISTERA. TWAYBLADE. 



1. L. convallarioides Torr. Simple solitary stem 3 in. to 

 a foot high, from fibrous and creeping 

 roots, with a pair of broad sessile opposite 

 leaves just below the raceme. Leaves or- 

 bicular, often pointed at apex, 1 to 2y 2 

 in. across. Flowers 6 to 12, greenish. 

 Sepals and petals linear, less than y^ in. 

 long; lip flat, 2-lobed, less than y 2 in. long. 



This peculiar plant, known at once by- 

 its single pair of rounded leaves, grows in 

 the edges of bogs by the Mineral Spring 

 of Yosemite Valley and may be expected 

 elsewhere, especially at somewhat higher 

 altitudes. 



7. CORALLORHIZA. Coral-root. 

 Pinkish or straw-colored plants, with coral-like rootstocks, 

 the erect stems terminating in naked racemes of dull-colored 

 flowers on short pedicels which become reflexed in fruit. 

 Leaves reduced to papery sheaths. Sepals and petals about 

 equal, the upper incurved. Pollen-masses in 2 pairs, distinct, 

 sessile upon a short oblong gland. 



1. C. multifldra Nutt. Plant 1 to 2 ft. high. Sepals oblique 

 at base and continued as a short spur, which is adnate to the 

 ovary; sepals and petals % to nearly y 2 in. long; "lower" 

 petal, or lip, concave, 3-lobed, nearly white and conspicuously 

 spotted with purple. — Growing among pine needles or other 

 decaying vegetation; widely distributed but nowhere common. 



2. C. bigeldvii Wats. Much like the preceding but with 

 the base of the sepals merely swollen over the ovary, not 

 spurred; sepals and petals larger, about y 2 in. long, strongly 

 veined but none of them spotted; "lower" petal very con- 

 cave, entire or barely toothed. — Found only in coniferous 

 forests or elsewhere in decaying vegetation; only occasion- 

 ally seen in the Yosemite district. 



SALICACEAE. Willow Family. 

 Deciduous trees and shrubs with alternate simple leaves 

 the stipules sometimes falling early. Flowers in narrow 

 spikes (catkins), the staminate and pistillate on different 

 plants. Calyx and corolla none. Stamens 1 to many. Fruit 

 a capsule with many seeds each with a tuft of hairs at base. 



