24 University of California Publications in Botany. [ VoL - 4 



Key to the Species of Callistemon grown in California. 



A. Stamens % to 1 in. long. 



Leaves lanceolate or oblong (mostly % in. or more wide). 



Spikes rather loose: leaves with prominent midrib and lateral 



nerves 1. C. lanceolatus. 



Spikes very dense, more highly colored: leaves thicker and lateral 



nerves obscure . - 2. C. speciosus. 



Leaves linear (less than *4 in - wide). 



Leaves flat, with prominent midrib, feather-veined 3. C. rigidus. 



Leaves channeled above, midrib and lateral veins obscure 



A. C. linearis. 



B. Stamens % in. or less long. 



Leaves flat: stamens pale -5. C. salignus. 



Leaves cylindric: stamens bright red, with yellow anthers ... 



6. C. brachyandrus. 



Fig. 9. Callistemon lanceolatus. Fig. 10. Callistemon speciosus. 



1. C. lanceolatus DC. Metrosideros semperflorens Lodd. 



A tall shrub with erect or spreading but seldom curved branches: 

 leaves lanceolate, 1^ to 2% in. long, about % in- wide, sharp-pointed, 

 midvein and lateral nerves prominent: flower-clusters 2 to 4 in. long, 

 not so dense as in the next species, bright red (rarely smaller and pale) : 

 stamens mostly 1 in. long: capsule ovoid, contracted at the summit. Illus- 

 trations: Fig. 9; Bot. Mag., pi. 260; Cav. Icon., pi. 332; Bailey, fig. 320; 

 Bot. Cook's First Voy., pi. 108; Maiden, Fl. PL and Ferns of N. S. W., 

 pi. 8. 



This Bottle-brush is one of the most showy and has entered 

 into several of the garden hybrids. Although not so "stiff and 

 rangy as C. rigidus, it requires severe pruning if a compact, 

 densely flowered shrub is desired. Seldom becomes more than 



