Flora of the Palousc Region 5 1 



81. CORAIXORHIZA. 



Scapose herbs, saprophytes or root-parasites, with large masses 

 of coral-like branching roots: leaves all reduced to sheathing 

 scales: flowers in terminal racemes: sepals nearly equal, the lateral 

 ones united at the base with the foot of the column, forming a 

 short spur or protuberance, the other one free, the spur adnate to 

 the summit of the ovary: petals about as long as the sepals, 1-3- 

 nerved; lip 3-ridged: column nearly free, slightly incurved, some- 

 what 2-winged; anther terminal; pollinia 4, in two pairs, oblique, 

 free, soft-waxy. 



Plant greenish-white: sepals and petals i-nerved. C. innaTa. 



Plant reddish: sepals and petals 3-nerved. C. mui/tiflora. 



C. innata R- Br. Scapes 10-20 cm. tall, pale yellowish, 3-15-flowered: 



sepals lanceolate, somewhat acute, i-nerved, 3-4 mm. long; spur very short: 

 petals like the sepals but broader, obtuse: lip oblong, obtuse or notched, 

 somewhat 3-lobed: column shorter than the petals. Very rare in deep woods, 

 Cedar Mountain. 



C. multiflora Nutt. Whole plant reddish or sometimes green, 15-25 cm. 

 tall, the spike many-flowered: sepals and petals 6-8 mm. long, 3-nerved: 

 spur grown to the ovary, 1-2 mm. long: lip ovate, white, mottled with purple, 

 3-lobed, with prominent ridges; middle lobe obtuse or notched, the lateral 

 ones acute: column nearly as long as the petals. Deep woods, Thatuna Hills. 



Sub-class 2. DICOTYEEDONES. 



Embryo of the seed with two cotyledons, that is with the first 

 leaves of the germinating plantlet opposite: stem usually differ- 

 entiated into bark, wood and pith by the regular arrangement 

 of the bundles of wood cells in one or more annual rings sur- 

 rounding the central cylinder of pith: leaves mostly net-veined: 

 parts of flowers in fours or fives, rarely in twos or sixes. 



Family 18. SAUCACEAE. 



Trees or shrubs with light wood, bitter bark and brittle twigs: 

 leaves alternate; stipules often minute: flowers solitary in the axil 

 of each bract, dioecious, both staminate and pistillate in aments 

 which expand before or with the leaves; staminate aments often 

 pendulous; pistillate pendulous, erect or spreading: staminate 

 flowers of x-many hypogynous stamens, subtended by a gland- 

 like or cup-shaped disk: pistillate flowers of a sessile or short- 

 stipitate i-celled ovary subtended by a minute disk; ovules usually 

 numerous: fruit an ovoid or oblong or conic 2-4-valved capsule; 

 seeds minute; endosperm none. 



Ament-bracts fimbriate or incised: stamens numerous: stigmas elongated. 



82. POPUtUS. 

 Ament-bracts entire: stamens 1-10: stigmas short. 83. sai,ix. 



