218 ANACARDIACEAE. 



axillary, peduncled. Sepals usually none. Petals usu- 

 ally 5, sometimes wanting. Stamens as many as petals 

 or 2-3 times as many; filaments usually with a thin 

 scale at the base or near the middle. Ovary 4-12-celled; 

 style terminal; stigma usually simple; ovules 1-numerous 

 in each cavity. Fruit various, dry in our species 



1. TRIBULUS L. 



Mostly diffuse or prostrate herbs, with evenly pinnate 

 leaves and yellow flowers. Sepals and petals 5, de- 

 ciduous. Stamens 10, hypogynous. Ovary 5-lobed, 

 5-celled, ovules 3-10 in each cavity. Fruit 5-angled, 

 spiny, splitting into 3-5-seeded segments. 



1. T. terrestris L. (Ground Burnut.) Pubescent much 

 branched prostrate annual, branches 2 dm. long or more; leaflets 

 5-8 pairs, 6-12 mm. long; flowers solitary in the axils, 12 mm. broad; 

 segments of the fruit usually with 2 long spines, 2 shorter and a 

 row of very short ones forming a dorsal crest. 



Railroad embankments, Los Angeles. 



Family 58. ANACARDIACEAE. Sumac Family. 



Shrubs or trees with a resinous and usually acrid juice, 

 alternate simple or compound exstipulate leaves. Flow- 

 ers small, regular, mostly 5-merous, often polygamous 

 or dioecious, variously clustered. Stamens as many or 

 twice as many as the petals. Ovary free, 1 -celled and 

 1-ovuled; styles sometimes 3. Fruit drupaceous. The 

 following genera were all referred to Rhus in the first 

 edition. 



Leaves 3-foliolate, deciduous. 



Ovary and fruit glabrous; nut ribbed. 1. Toxicodendron. 



Ovary and fruit villous; nut smooth. 2. Schmaltzia. 



Leaves simple, persistent. 



Ovary and fruit densely pubescent and 



viscid. 3. Neostyphonia. 



Ovary and fruit glabrous. 4. Malosma. 



1. TOXICODENDRON Mill. 



Shrubs or climbing vines, with 3-foliolate or pinnate 

 leaves, poisonous to the touch. Flowers in axillary 



