RUE FAMILY 17 



yellow ; segments of the fruit with 2 long stout spines, 2 shorter ones and a row of very short 

 ones forming a dorsal crest. 



A fugitive from Europe, and becoming a troublesome weed in many parts of the Sacramento and San 

 Joaquin Valleys and in southern California. March-June. 



Zygophyllum Fabago L. Sp. PI. 385. 1753. Syrian Beaii-caper. Much-branched erect herb with deep 



4. KALLSTROEMIA Scop. Introd. 212. 1777. 



Annual herbs with diffusely branching, spreading or prostrate stems. Leaves opposite, 

 abruptly pinnate, one of each pair alternately smaller or wanting; leaflets oblique. Stipules 

 subulate. Flowers solitary on axillary peduncles. Sepals 5 or 6 ; marcescent. Petals 4-6, 

 yellow or white, caducous. Stamens 10 or 12, hypogynous; the filaments opposite the 

 petals adnata to them, the others shorter and subtended externally by a small gland. Ovary 

 8-12-celled, without transverse septa ; styles united ; stigma capitate. Fruit 8-12-angled, 

 more or less tuberculate or roughened, separating at maturity into 8-12 bony, 1-seeded 

 or rarely 2-seeded nutlets. Seeds obovate, with a membranaceous testa. [Meaning of 

 name not clear but thought by some to be derived from the Greek xaXJio?, beautiful, and 

 Stroemia, a genus of the Capparidaccae.} 



A genus of about 15 species, southwestern United States to tropical South America, West Indies, and 

 Australia. Type species, Tribulus niaximiis L. 



1. Kallstroemia californica (S. Wats.) Vail. California Kallstroemia. 



Fig. 3004. 



Tribulus ralifornicus S. Wats. Proc. Amer. Acad. 11: 125. 1876. 

 Kallstroemia californica Vail, Bull. Torrey Club 22: 230. 1895. 



Stems diffusely branching, decumbent, \-^ dm. long, pubescent or somewhat hirsute with 

 whitish hairs when young, becoming glabrate. Leaves 2-5 cm. long ; leaflets 5-7 pairs, 5-10 mm. 

 long, elliptic, hoary-pubescent ; peduncles shorter than the leaves ; sepals 3^ mm. long, lanceolate ; 

 petals yellow, about equaling the sepals, obovate; fruit strigose; carpels 8-10, with pointed 

 tubercles on the back, the inner faces nearly smooth ; beak shorter than the carpels, obtuse, 

 glabrous. 



Light sandy or gravelly soils; Lower Sonoran Zone; Mojave and Colorado Deserts, southern California to 

 Arizona, eastern Lower California, Sonora, and Sinaloa. Type locality: Lower California, on the east side of the 

 peninsula. June-Sept. 



Kallstroemia grandiflora Torr. ex A. Gray, Smiths. Contr. 3^: 28. 1852. Stems diffusely branched, 

 decumbent or suberect, 2-5 dm. long, angled, hirsute with twisted hairs, interspersed with longer cili-a. Leaves 

 2-7 cm. long; leaflets 5-9 pairs, obliquely oblong, 8-15 mm. long, ciliate, pubescent or glabrate beneath- sepals 

 linear-lanceolate, 8-15 mm. long; petals 12-25 mm. long, obovate, deep yellow; fruiting carpels 10, pubescent, 

 tuberculate on the back, the inner faces reticulate. Sandy or gravelly desert washes; Lower Sonoran Zone; 

 southwestern Arizona to Texas and Colima. Type locality: borders of the Gila River, Arizona. To be 

 expected on the California deserts. 



Family 75. RUTACEAE. 

 Rue Family. 



Aromatic trees or shrubs, or sometimes herbaceous or scandent, with punctate 

 glands. Leaves alternate or opposite, pinnately or palmately compound or simple ; 

 petioles often winged. Flowers perfect, polygamous or dioecious, in an axillary or 

 terminal inflorescence. Calyx of 3-5 sepals or lobes, or rarely wanting. Petals 3-5 

 or rarely more, usually imbricate. Stamens as many or twice as many as petals, 

 the filaments distinct or united below, inserted on a hypogynous disk. Pistil of 1-5 

 distinct or united carpels ; styles distinct or connate ; stigma simple or lobed. Ovules 

 2 or rarely more in each cell. Fruit various, often a berry. Seeds 1 to many in each 

 cell, with or without endosperm. 



A family of about 110 genera and 900 species, mainly tropical and most abundant in South America and 

 Australia. 



Fruit a samara or 2-lobed capsule: leaves alternate. 



Leaves compound; fruit a samara, winged all around. L Ptelea. 



Leaves simple; fruit a 2-lobed capsule. 2. Thamnosma. 



Fruit a berry; leaves opposite, simple. 3. Cncortdtum. 



1. PTELEA L. Sp. PI. 118. 1753. 



Shrubs or small trees, unarmed, the bark bitter. Leaves deciduous, 3-5-foliolate. the 

 leaflets entire or serrulate, punctate and ill-smelling. Inflorescence of corymbose or panic- 



