FROSTWEED 



445 



FIG. 194. Helianthemum canadense: The plant produces two kinds of flowers, 

 the normal or ephemeral, being terminal and having large yellow petals 

 (A); and others that are very small, axillary and apetalous (B). C, one of 

 the lanceolate leaves. D, a pistil from one of the normal flowers. E, an 

 open capsule developed from one of the normal flowers and enclosing a 

 number of small seeds. F, a capsule from one of the apetalous flowers. 

 G, section through one of the small seeds showing the curved embryo. H, 

 transverse section of leaf: ep, epidermal cells of ventral surface; P, palisade 

 cells; M, loose mesophyll; D, epidermal cells from the lower or dorsal sur- 

 face. /, stellate hairs which are abundant on the dorsal surface of the leaf 

 and occur to some extent also on the ventral surface. K, one of the long- 

 stalked glandular hairs which are abundant on the dorsal surface of the scale- 



