RUTACEAE 



577 



Rusbya Britton (Anthopterus EP.). Ericaceae (in. 2). i Bolivia. 



Rusbyanthus Gilg. Gentianaceae (i). i Bolivia. 



Rusbyella Rolfe. Orchidaceae (ll. 19). i Bolivia. 



Ruscus (Tourn.) L. Liliaceae (vil). 3 Medit., Eur. R. acuhatus 

 L., butcher's broom, in Brit., a small shrub. In the axils of scaly 1. 

 stand leaf-like phylloclades; half-way up each is another scaly L, 

 in whose axil stands the fl. Berry. [Cf. Asparagus and Semele.] 



Rush, Junc'iis ; beak-, Khynchospora; bul-, Typha; Dutch-, Eqtd- 

 setutu; flowering--, Bit f omits; -grass (Am.), Sporobolus ; spike-, 

 Eleocharis; wood-, Litznla. 



Ruspolia Lindau. Acanthaceae (IV.B). 2 Somaliland. 



Russelia Jacq. Scrophulariaceae (n. 4). 8 trop. Am. K. juncea 

 Zucc., often cult., is xero. with much reduced 1. and pendulous 

 green stems. Shoots sometimes appear under cult, with broad 1. 

 (perhaps a reversion to an ancestral type). 



Russian thistle, Salsola Kali, L., var. tragns Moq. 



Russowia C. Winkler. Gompositae (n). i Turkestan. 



Rust, Berberis, Triticittn. 



Rustia Klotzsch. Rubiaceae (i. i). 6 trop. Am. 



Ruta (Tourn.) L. Rutaceae (i). 50 Medit, As. R. graveolens L., 

 rue, cult., is a strongly smelling shrub, owing to the presence in the 

 1., &c., of an ethereal oil. The terminal fl. of the infl. is 5-merous, the 

 lat. fls. 4-merous. The sta. lie in pairs in the boat-like petals ; one 

 by one they bend upwards over the stigma, dehisce and fall back ; 

 when all have done this, the stigma ripens, and finally the sta. again 

 move up and effect self-fert. Chiefly visited by small flies. Rue is 

 a narcotic and stimulant. 



Rutabaga, Brassica cainpestris L. 



Rutaceae (EP., BH. add II to Meliaceae). Dicots. (Archichl. Gera- 

 niales). 100 gen., with 800 sp. trop. and temp., esp. S. Afr. and 

 Austr. Most are shrubs and trees, often xero., frequently of heath- 

 like habit (e.g. Diosma). L. alt. or opp., exstip., usu. cpd., with 



B 



Floral diagrams of Rutaceae, after Eichler. A, Knta gravfolens (d = disc) ; B, Citrus 

 Aurantittm, single case showing variable numbers in stamen-bundles. 



glandular dots, often aromatic. In many Aurantiead there are short 

 shoots whose 1. are reduced to thorns (cf. Cactaceae). Infl of various 

 forms, usu. cymose. Fl. $ , rarely unisexual, reg. or -I- , 5 4-merous 

 (see Ruta), with a large disc below the G. K 5 or 4, the odd sepal 



W. 



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