Genus 2. 



CALTROP FAMILY. 



443 



I. Kallstroemia intermedia Rydb. Greater Cal- 

 trop. Fig. 2689. 



Kallstroemia intermedia Rydb. N. Am. Fl. 25: 113. 1910. 



Annual, branches slender, hirsute and pilose, pros- 

 trate, 6'-i8' long. Leaves short-petioled ; stipules sub- 

 ulate, shorter than the petioles; leaflets 3-5 pairs, oval, 

 or oblong, inequilateral, acute or obtuse at the apex, 

 rounded or subcordate at the base, 4"-io" long; pedun- 

 cles slender, 6"-2' long in fruit; flowers i' broad, or 

 less; sepals linear-lanceolate, very pubescent, persistent, 

 shorter than the petals; fruit ovoid-conic, strigose- 

 canescent, about 3" in diameter, shorter than the stout 

 persistent style, the segments tubercled. 



In dry soil, Missouri to Kansas, Texas, New Mexico and 

 Chihuahua. Included in our first edition in K. maxima (L.) 

 T. & G., which has glabrous fruit. April- .Sept. 



2. Kallstroemia hirsutissima Vail. Hirsute Cal- 

 trop. Fig. 2690. 



Kallstroemia hirsutissima Vail, in Small, Fl. SE. U. S. 670. 

 1903. 



Annual, branches stout, appressed cinereous-pubes- 

 cent and hirsute. Leaves short-petioled; stipules lan- 

 ceolate; leaflets 3-4 pairs, elliptic, 4"-io" long, shaggy- 

 hirsute^ at least beneath ; peduncles stoutish, s"-8" long ; 

 flovyers 6"-f' broad, yellow or orange-yellow, fading 

 whitish ; sepals linear-lanceolate, as long as the petals 

 or nearly so; fruit broadly ovoid-conic, 3"-4" in diam- 

 eter, longer than the conic style, the segments sharply 

 tubercled. 



In dry soil, Kansas and Colorado to Texas, New Mexico 

 and Mexico. July-Aug. 



Family 67. RUTACEAE Juss. Gen. 296. 1789. 



Rue Family. 

 Trees or shrubs, rarely herbs, with heavy-scented and glandular-punctate foliage, 

 alternate or opposite mainly compound exstipulate leaves, and (in our species) 

 polygamo-dioecious generally cymose flowers. Sepals 3-5, or none. Petals 3-5, 

 hypogynous or perigynous. Stamens of the same number, or twice as many, dis- 

 tinct, inserted on the receptacle ; anthers 2-celled, mostly versatile. Disk annular. 

 Pistils 1-5, distinct, or I and compound of 2-5 carpels, inserted on the somewhat 

 elongated receptacle. Fruit (in our species) capsular or a samara. Seeds oblong 

 or reniform; embryo straight or curved; endosperm generally fleshy, sometimes 

 none ; cotyledons thick or foliaceous. 



About no genera and 950 species, most abundant in South Africa and Australia. 

 Pistils 1-5, distinct; fruit fleshy, capsular. i. Zanthoxylum. 



Pistil I, 2-celIed ; fruit a samara. ' 2. Ptelea. 



I. ZANTHOXYLUM L. Sp. PI. 270. 1753. 

 [Xantho.xylum Mill. Card. Diet. Ed. 8. 1768.] 

 Trees or shrubs with alternate pinnate leaves, the twigs and petioles commonly prickly. 

 Flowers axillary or terminal, cymose, whitish or greenish, mostly small. Sepals 3-5, or none. 

 Petals 3-5, imbricated. Staminate flowers with 3-5 hypogynous stamens. Pistillate flowers 

 with 1-5 distinct pistils, rarely with some stamens. Carpels 2-ovuled. Pods fleshy, 2-valved, 

 I-2-seeded. Seeds oblong, black and shining. [Greek, yellow-wood.] 



