Scrophulariaceae and Orobanchaceae 163 



fined largely to the angles formed by the bases of the calyx teeth. 

 The former type is roughened along the margins. Epider- 

 mal cell walls are wavy. 



Bartsia alpina has a relatively large calyx of 4 parts, with the 

 teeth about as long as the tubular part. Long-stalked gland- 

 ular hairs are abundant; the stalk consists of 3 to 6 slender cells, 

 while the top of it has from 2 to 5 cells arranged in parallel rows. 

 Pointed multicellular hairs, though present, are few in number. 

 Epidermal cells are irregular in outline. 



In Harveya the tubular part of the calyx is short and the 5 

 lobes extend almost to the base. As already described in con- 

 nection with the stem histology, the hairs are of maximum size 

 and wholly glandular. The stalk cells are comparatively wide 

 and stout, are 3 to 6 in number, and capped by the gland cells. 

 Unlike the majority of the genera already described, the hairs 

 in this genus fringe the edges of the sepals. 



Hyobanche has a calyy of 5 parts which are almost distinct 

 and more rounded than in Harveya. 



Among the Orobanchaceae similar variation may be seen in 

 the calyx, as in Scrophulariaceae. According to Le Maout and 

 Decaisne (27, p. 593) the "calyx is persistent, tubular or cam- 

 panulate, 4-5 fid, or of 4 sepals more or less completely united in 

 lateral pairs." 



In species of Orobanche variation occurs, for the calyx may be 

 split both above and below, nearly or quite to the base; the di- 

 visions may be 2-cleft or entire, or more or less unequally 2- to 

 5-toothed. In 0. coerulea and 0. minor the teeth are about as 

 long as the tube, and are lanceolate-subulate. The hairs on 

 these two species are similar to those of Harveya but smaller. 



The calyx of Epiphegus is small, the teeth very much shorter 

 than the tube below. Cooke and Schively (28, p. 377) state 

 the following concerning hairs: "One-celled, rarely two-celled 

 hairs fringe the edges of the lobes. Below, across the base of 

 the lobes, there extends a band of two or three-celled hairs, 

 longer than the UDper hairs. All of these hairs are on the outer 

 surface of the calyx; none are present on the inner surface. They 

 have a swollen granular appearance." The writer has found 

 his own descriptions to agree with the above. 



In Lathraea the calyx is bell-shaped with 4 to 5 rounded teeth 

 above. 



