134 



SELECTED WESTERN FLORA 



2. L. Kalmii, L. 



Stem low, leafy, often branched, obscurely angled ; leaves linear ; flowers 

 light blue on slender pedicels, each with two minute bracts or glands about 

 the middle. Wet grassy ground, Man.-Alta. 



LXXXVI. COMPOSITJE. 



Flowers small, in a head on a eomtnon receptacle surrounded 

 by an involucre of one or more rows of bracts; stamens 5, inserted 

 on the corolla tube, the anthers united {syngenesious); ovary 

 1-oelled forming an achene in fruit; style cleft at the apex with 2 

 usually recurved stigmas, or frequently undivided in sterile flowers ; 

 calyx represented by a number of bristles or scales (pappus) , or absent ; 

 corolla tubular or strap-shaped [ligulate), when the former usually 

 5-toothed. When both tubular and ligulate corollas are present in 

 the same head the former are in the centre (-disk), and the latter 

 {ray-flowers) are around the margin. Such a head is called radiate, 

 while if only tubular corolla are present, the head is said to be dis- 

 coid. A very large family divided by the kinds of corollas present 

 in the heads into two series, the tubuUflorce and the ligulifl,orm. 



Fig. 80. 



- Section through a typical 

 radiate head. 



A. ray-flower ; B, disk-flower ; C, achene ; 

 D, receptacle ; E, involucre ; F, stigma. 



Fig. 81. — Ligu- 

 late flower. 



C, achene; D, corolla: E, atigma; 

 F, anthers forming a tube about the- 

 style. 



