306 FLORA. 



strongly 2-wingcd toward the base; capsule about 10 mm. long. In woods, Mass. 

 to Ohio, Fla. and Tex. Feb. -May. 



4. Corallorhiza multifldra Nutt. Large Coral-root. (I. F. f. 1142.) 

 Scape 2-5 dm. high, purplish, clothed with several appressed scales. Raceme 

 5-20 cm. long, IO-30-flowered; flowers 12-18 mm. long, brownish purple, short- 

 pedicelled; sepals and petals somewhat connivent at the base, linear-lanceolate, 

 about 6 mm. long; lip white, spotted and lined with purple, oval or ovate in out- 

 line, deeply 3-lobed, crenulate, the middle lobe broader than the lateral ones, its 

 apex curved; spur manifest, yellowish; capsule ovoid or oblong, 10-16 mm. long. 

 In woods, N. S. to Br. Col., south to Fla., Mo. and Cal. July-Sept. 



Corallorhiza multiflora fldvida Peck. Whole plant light yellow; lip white, un- 

 spotted. Perhaps distinct. N. Y. to Neb. and Aid. 



5. Corallorhiza striata Lindl. Striped Coral-root. (I. F. f. 1143.) 



Scape stout, purplish, 2-5 dm. high. Raceme 5-15 cm. long, 10-25 -flowered. 

 Flowers dark purple; sepals and petals narrowly elliptic, striped with deeper 

 purple lines, 12-14 mm. long, spreading; lip oval or obovate, entire or a little 

 undulate, somewhat narrowed at the base, about as long as the petals; spur none, 

 but the perianth has a gibbous saccate base ; capsule ellipsoid, reflexed, 16-20 mm. 

 long. In woods, Ont. and N. N. Y. to Mich., Ore. and Cal. July. 



26. HEXALECTRIS Raf. 



Scapose herbs, from thick scaly rootstocks and fleshy coralloid roots, the leaves 

 reduced to purplish scales, sheathing the scape. Flowers bracted in a loose ter- 

 minal raceme. Perianth not gibbous or spurred at the base, the petals and sepals 

 similar, nerved, spreading. Lip obovate, with several crested ridges down the 

 middle, somewhat 3-lobed, the middle lobe a little concave. Column free, thick, 

 slightly incurved. Pollinia 8, united in a cluster. Capsule ellipsoid, the fruiting 

 pedicels thick. [Greek, signifying six crests.] A monoty pic* genus of the south- 

 eastern United States and Mexico. 



1. Hexalectris spicata (Walt.) Barn. Crested Coral-root. (I. F. f. 1146.) 

 Scape stout, 2-5 dm. high, its upper scales lanceolate, the lower sheathing and 

 truncate or acute. Raceme 10-18 cm. long, 8-12-flowered; flowers large, brownish 

 purple, 25 mm. high or more; pedicels short, stout; sepals and petals narrowly 

 elliptic, obtuse or acutish, spreading, striped with purple veins, 12-18 mm. long, 

 longer than the broad lip; middle lobe of the lip rounded or crenulate, the lateral 

 ones shorter, rounded; column slightly spreading at the summit, shorter than the 

 lip; capsule ellipsoid, about 2 cm. long. In rich woods, N. Car. to Ky. and Mo., 

 south to Fla. and Northern Mexico. Aug. (H. aphyllus Raf.) 



Sub-class 2. DICOTYLBDONBS. 



Embryo of the seed with two cotyledons (in a few genera one only, as 

 in Cyclamen, Pinguicula and some species of Cap?ioides), the first leaves 

 ot the germinating plantlet opposite. Stem exogenous, of pith, wood 

 and bark (endogenous in structure in Nymphaeaceae), the wood in one or 

 more layers surrounding the pith, traversed by medullary rays and cov- 

 ered by the bark. Leaves usually pinnately or palmately veined, the 

 veinlets forming a network. Parts of the flower rarely in 3's or 6's. 



Dicotyledonous plants are first definitely known in Cretaceous time. They constitute 

 between two-thirds and three-fourths of the living angiospermous flora. 



Series I. Choripetalae. 



Petals separate and distinct from each other, or wanting. 



The series is also known as Archichlamideae, and comprises most of the fami- 

 lies formerly grouped under Apetalae (without petals) and Polypetalae (with sepa- 

 rate petals). Exceptions to the typical feature of separate petals are found in the 



