Spring Flora of Oklahoma 
87 
Waste places. May-September. Common. Becoming a very 
bad weed in Oklahoma. 
II. KALLSTROEMIA Scop 
Annual, branching, pubescent herbs, the branches often 
prostrate, with opposite evenly-pinnate leaves, and soli¬ 
tary, axillary, yellow flowers. Petals and sepals 5. Stam¬ 
ens 10. Fruit 10-12-lobed, not spiny, often tubercled, 
splitting into 10-12 1-seeded segments. 
1. Kallsfcrcemia intermedia Rydb. Greater Caltrop. Annual, 
branches slender, hirsute and pilose, prostrate, 5'-18' long. Leaf¬ 
lets 3-5 pairs, oval or oblong, inequilateral, 4"-10" long. Flowers 
V broad or less, yellow. Fruit ovoid-conic, strigose-canescent, about 
3" in diameter, shorter than the persistent style, segments tubercled. 
In dry soil. April-September. Grady County. 
FAMILY 44. RUTACEJE. Rue Family. 
Trees or shrubs, with heavy-scented and glandular- 
punctate foliage, alternate or opposite, mainly compound 
leaves without stipules, and polygamo-dicecious, generally 
cymose flowers. Sepals 3-5, or none. Petals 3-5, hypogy- 
nous or perigynous. Stamens of the same number, or 
twice as many, distinct. Pistils 1-5, distinct, or 1 and 
compound of 2-5 carpels. Fruit a capsule or a samara. 
Pistils 1-5, distinct; fruit fleshy, capsular. 
I. Zanthoxylum. 
Pistil 1, 2-celled; fruit a samara. II. Ptelea. 
I. ZANTHOXYLUM L. 
Trees or shrubs, with bark, twigs and petioles usually 
prickly. Leaves odd-pinnate, marked with translucent 
dots. Flowers in axillary or terminal cymes or umbels, 
monoecious or dioecious. Sepals and petals 3-5 or none. 
Stamens 3-5, hypogynous. Pistils 2-5, distinct. Carpels 
2-valved, 1-2-seeded. Seeds smooth and shining, 
