22 University of California Publications in Botany. [VOL. 4 



In addition to the Bottle-brush group there are a number of 

 related genera, all members of the Myrtle Family, more or less 

 common in cultivation. Such are the Eucalypti, of which 

 something like 100 species are now grown in California. There 

 is also a genus, Angophora, distinguished from Eucalyptus by 

 the five small calyx-teeth and colored petals. Angophora lanceo- 

 lata and A. intermedia, both with ribbed, turbinate capsules, are 

 grown here. The former is a tree with smooth, deciduous bark, 

 the latter is a tree with rough, persistent bark. Syncarpia 

 laurifolia is sometimes mistaken for Eucalyptus but has distinct 

 petals and the fruits are fused into a small head. 



.Tristania conferta is a related tree resembling our native 

 Madron e in general habit. It has conspicuous flowers with five 

 petals each and the stamens united into bundles. The Aus- 

 tralian Brush Cherry (Eugenia), with fleshy, edible fruits, is 

 also a member of the Myrtaceae. Kunzea is a genus of slender 

 heath-like shrubs with small leaves, belonging to this family but 

 seldom seen in cultivation. 



Six other genera, all natives of Australia and surrounding 

 regions, are of especial interest in California gardens and parks. 

 These constitute what may be considered the Bottle-brush group 

 and may be distinguished by the following key : 



Key to the Genera. 

 Anthers attached by the middle (leaves various: stamens either united or 



distinct). 

 Flowers in spikes or heads or solitary in the leaf -axils. 



Stamens much longer than the petals: flowers in dense clusters. 

 Filaments not united or only slightly united at the very base 



Callistemon (p. 22). 



Filaments united into 5 clusters Melaleuca (p. 27). 



Stamens shorter than the petals. 



Leaves not 1 in. long: flowers not in close heads, white 



.-. Leptospermum (p. 35) . 



Leaves 2 to 6 in. long: flowers in small close heads, white 



Agonis (p. 36). 



Flowers in loose terminal cymes Metrosideros (p. 36). 



Anthers attached by the base: leaves terete, punctate: stamens red, 

 united Calothamnus (p. 37) . 



CALLISTEMON. 



The name Bottle-brush is particularly applicable to this genus 

 of shrubs, the flowers being arranged in dense cylindrical spikes 



