304 XXXIII. RUTACE^ (OLIVER). [Ruta. 



opening at the apex. Seeds albuminous. — Herbs, often shrubby below, 

 glandular-punctate. Leaves alternate, often pinnati- or 2-pinnatisect. 

 Flowers in terminal corymbose cymes. 



A considerable genus of the Mediterranean region, Atlantic Islands, and Western Asia. 



Flowers usually 4-merou3. Petals fimbriate. Leaves divided . . . 1. R. graveolens. 

 Flowers usually S-merous. Petals entire. Leaves undivided {Haplo- 

 phytum). 2. R. tuberculata. 



1. R. graveolens, Linn.; DC. Frod. i. 710, var. bracteosa. Leaves 

 2-pinnatipartite ; segments oval- or oblanceolate-oblong, obtuse. Bracts 

 sessile, ovate or cordate-based, amplexicaul. Petals fimbriate. Filaments 

 glabrous. 



Nile Land. Abyssinia, Dillon and Petit ! 



Perhaps only cultivated. Mediterranean region, Syria, etc. 



2. R. tuber culata^ Forsk, ; DC. Frod. i. 711. More or less pro- 

 nrnnently gland-tubercled. Leaves undivided, linear, oblanceolate to ol)ovate- 

 cuneate. Petals entire. Filaments pilose. — Haplophytiim., A. de Juss. in 

 Mem. Mus. xii. 528. t. 17. f. 10. 



Nile I<and. Nubia, Schweinfurth ! Ehrenherg ; White Nile, Cienkowski. 

 North Africa eastward to Scinde. 



2. ZANTHOXYLUM, Linn. ; Benth. et Hook. f. Gen. PI. i. 297. 



Flowers polygamous (or dioecious?). Calyx 4-5-fid or -partite; segments 

 imbricate. Petals 4-5, free, imbricate or valvate. Male ti. : Stamens as 

 many as and alternate with the petals, hypogynous. Ovary rudimentary. 

 Female fl. : Stamens or scale-like. Carpels 1-5, oblique, each l-celled, 

 usually biovulate. Fruit of 1-5 cocci, dry or drupaceous, usually opening 

 in 2 valves, 1-seeded. Seed^ with a crustaceous or bony testa and straight 

 or curved embryo in the axis of a fleshy albumen. — Shrubs or trees, glabrous 

 or pubescent, with or withoui prickles. Leaves alternate, imparipinnate, 3- 

 or 1-foliolate ; leaflets articulate, entire or crenulate, glandular-dotted. 

 Flowers small, white or greenish, in terminal and axillary panicles. Fruit, 

 often the entire plant, aromatic or pungent. 



A considerable tropical genus. The following species appear to be endemic. 



flowers sessile, 5-merous. Leaves multifoliolate, 2-3 ft. ; leaflets 



5-8 in. long \. Z. macrophyllum. 



Flowers sessile. Leaves 5-9-foliolate ; leaflets obovate-oblong, ob- 

 tuse or broadly apiculate 2. Z. senegalense. 



Flowers equalling the pedicels. Leaves 5-9-foliolate ; leaflets el- 

 liptical, acuminate, 4-5 in. by £5 in Z. Z. melanacanthum. 



Flowers equalling the pedicels, usually 4-merous. Leaves multi- 

 foliolate; leaflets oval» acuminate, 2-3 in. by 1-1^ in. ... 4. Z. rubescens. 



Flowers 5-merous. Leaves 13-15-foliolate, rachis 5-8 in. ; leaflets 



ovate-lanceolate, 1-2 in. by ^-^ in h. Z. Lepiieurii. 



1. Z.? macrophyllum, O/zt;. A glabrous tree of 30-40 ft. Prickles 



