KEY TO THE BROOMS AND GORSE 115 



KEY TO THE BROOMS AXD GOESE IX CULTIVA- 

 TION, INCLUDING THOSE IN HOTHOUSES 

 NORTH OR IN THE OPEN SOUTH 



* Flowers along the sides of branches not in decided clusters, either 



solitary or 2 or 3 in a cluster. (A.) 

 A. Flowers yellow ; leaves deciduous. (B. ) 



B. Pods hairy on the margins, smooth on the sides, 1-2 inches 

 long; branches angled; erect, 5-10 feet. Scotch Buoom 

 (128) — Cytisus scoparius. 



B. Pods hairy all over, 1 inch long ; branches round ; blades of 

 leaves hairy, i-| inch long. Hairy Broom (130) — Cytisus 

 hirsutus. 



A. Flowers white ; tender North. (C.) 



C. Branches slender but not thread-like, grooved ; erect, to 3 feet. 

 Portugal Broom — Cytisus albus. 



C. Branches thread-like and angulate — Cytisus filipes. 

 C. Branches long, slender, pubescent, round, not angulate or 

 grooved ; shrub to 12 feet ; leaves all 3-bla(led. Proliferous 

 Laburnum or Tagasaste — Cytisus proliferus. 

 A. Flowers pink to purple ; procumbent shrub frequently grafted on 

 an erect stem to form a weeping plant ; tender North. Purple 

 CvTisus (131) — Cytisus purpureus. 



* Flowers in rounded terminal heads, yellow or brownish when fad- 



ing, nearly 1 inch long, July, August; pod hairy, 1-1| inches long; 

 branches round and hairy ; blades |-1 inch long ; hardy to Wash- 

 ington. Cluster-flowered Laburnum — Cytisus capit^tus. 



* Flowers yellow in elongated terminal clusters. (D.) 



D. Leaves evergreen ; branches grooved ; hardy only South. (E.) 

 E. Blades widening towards tip, wedge-shaped. (F.) 

 F. Blades |-f inch long, pubescent beneath. Cytisus candicans. 

 F. Blades \-^ inch long, scabby beneath. Cytisus mader^nsis. 

 F. Blades i-f inch long, pubescent on both sides; flowers in 

 one-sided clusters. (G.) 

 G. Racemes shortened; blades usually under ^ inch long 

 (the Genfsta of florists). Yellow or Florists' Genista 

 (132) — Cytisus canari^nsis. 

 G. Racemes longer, 3-5 inches long ; blades usually over 

 1 inch long. " A hybrid of garden origin and better than 

 the last. Racemed Cytisus — Cytisus racemosus. 

 E. Blades linear, ^-1 inch long with rolled edges ; to 3 feet. Nar- 

 Row-BLADED Cytisus (133) — Cytisus linifolius. 



