484 XXXIII. RUTACE^. (J. D. Hooker.) 



Order XXXIII, RUTACE^a:. (By J. D. Hooker.) 



Trees or shrubs, rarely herbs, abounding in pellucid glands filled with 

 essential oil (except Peganum). Leaves opposite or alternate, simple or 

 compound, exstipulate. Flowers in axillary or terminal cymes or panicles, 

 (racemed in Dictamnus), never spiked, usually bisexual and regular in the 

 Indian species (except Dictamnus). Calyx of 4-5 small lobes or sepals. 

 Petals 4-5, hypogynous (in the Indian ge/iera), valvate or imbricate. Stamens 

 4-5 or 8 or 10, rarely more (Gitrvs, -^gle), or 6 {Bwnninghausenia), fila- 

 ments usually free, hypogynous ; anthers 2-celled, opening in^ar^s. Didc 

 within the stamens, crenate or lobed, sometimes large or long. Ovary of 4-5 

 free or connate carpels ; styles as many, free or variously united, stigmas 

 terminal, entire or lobed'; ovules usually t in each cell. Fruit a capsule, 

 berry or drupe, or of 1-4 capsular cocci. Seeds usually solitary in tlie 

 cells, testa various, albumen fleshy or ; embi-yo'straight or curved, radicle 

 superior. — Distrib. Tropical and extratropical plants ; many are S. African 

 and Australian. Genera b3, and about 650 species. 



Tbibe I. Ruteae. Herbs, rarely shrubby. Flowers hermaphrodite. 

 Disk thick. Ovary deeply 3-5-lobed ; styles basilar or ventral, free or 

 united ; cells 3- or more ovuled. Fruit capsular. Albumen fleshy ; embryo 

 usually curved. 



* Flowers regular. 



Petals 4-5. Stamens 8-10. Ovary sessile . . . .1. Rdta. 



Vetale 4. Stamens 6-8. Ovary pedicelled ... 2. Bcennikohadsenia. 



Petals 4-5. Stamens 12-15 .... 3. Peganum. 



** Flowers irregular. 



4. DiCTAMNDS. 



Teibe II. Zanthoxyleae. Strubs or trees. Flowers usually polyga- 

 mous. Disk free, rarely 0. Ovary deeply 2-5-lobed ; styles basilar or 

 ventral, more or less free ; cells 2-ovuled. Fruit-carpels capsular. 



Leaves opposite. Stamens 4^5 . 5. Evodia. 



Leaves opposite. Stamens 4, with 4 staminodes opposite 



the petals • . '. . . 6. Tetractomia. 



Leaves opposite. Stamens 8 . 7. Melicopb. 



Leaves alternate. Stamens 3-5 8. Zanthoxylum. 



Tribe III. ToddaliesB. Shrubs or trees. -PYcwera usually polygamous. 

 Disk free. Ovary entire ; style single ; cells 1-2-ovuIed. Fruit syncarpous. 

 Seed albuminous ; cotyledons usually flat. 



Stem usually prickly. Leaves compound. Petals and 



stamens 2-5 each 9. Toddalia. ' 



Stem unarmed. Leaves l-3-)oIiolate. Petals 4. Stamens 8 10. Acronychia. 



Stem unarmed. Leaves simple. Petals and stamens 4-5 each 11. Skimmia. 



Teibe IV. Aurantieae. Shrubs or trees. Flowers hermaphrodite. Petnh 

 and stamens free or connate. Ovary entire ; style simple ; cells !-<» -ovuled 

 Berry usually pulpy. Seed exalbuminous. 



* Ovules solitary or tvnn in each cell. 



Style very short, persistent 12. Glycosmis. 



