TAMARISK: LILAC: HORSE-CHESTNUT 93 



Salix repens, L. Creeping Willow. 



Forms of S. phylicifolia and of S. nigricans with hairy 

 capsules also come here (see p. 89). 



** Capsule trigonal, 3-valved, in spikes not 

 catkins. 



Tamarix gallica, L. Tamarisk. The small, crowded, 

 triangular and scale-like leaves, closely imbricated on 

 slender feathery branches, at once distinguish this from 

 the Willows. 



(/3) Seeds of medium or large size, few, not 

 coniose. 



* Capsule woody, 2-valved ; seeds about 4, 

 bordered by a membranous wing. 



Syringa vulgaris, L. Lilac (Fig. 92). 



** Capsule with more than 2 valves ; seeds 

 not appreciably winged. 



+ Capsule very large 1 , leathery, opening in 3 

 valves, and exposing one or two very large 

 shining brown sub-globose seeds with broad 

 hilum. 



^Esculus Hippocastanum, L. Horse-chestnut. The 

 coarsely prickly capsule of the Horse-chestnut must 

 not be confounded with the densely prickly cupule of 

 the Chestnut. The former is a true fruit of 3 carpels 

 enclosing true seeds, with no trace of stigmatic or 

 perigone scars : the latter is an accessory investment 

 surrounding the true fruits, chestnuts, which bear traces 

 of stigmas, &c. at their apex. 



ft Capsule not large, with more than 3 valves. 



1 For a 3-valved capsule that is not very large and contains about 

 six wingless seeds, see Buxus in the Appendix, page 154. 



