Part 2, 1910] ZYGOPHYLLACEAE 111 



Flowers small ; petals 3-10 mm. long. 



Fruit glabrous ; sepals lanceolate ; beak of the fruit about equaling the 



body, decidedly conic at the base. 1. A', maxima. 



Fruit strigose; sepals linear-lanceolate or subulate (except in A", canescens). 

 Beak of the fruit shorter than the body, and (except in A", glabrata 

 and sometimes A". California!) decidedly conic at the base. 

 Plant sparingly pubescent or glabrate. 



Petals 6-7 tntn. long ; beak of the fruit nearly as long as the body. 2. A", caribaea. 

 Petals 3-5 mm. long; beak much shorter than the body of the fruit. 

 Leaflets 3-4 pairs ; nutlets with blunt tubercles and strongly 

 reticulate inner faces. 

 Style columnar, rather slender ; leaves glabrous or nearly so. 3. A', glabrala. 

 St'vle decidedly conic, thick ; plant pubescent. 4. A', brachysiylis. 



Leaflets 5-6 pairs" ; nutlets with sharp tubercles and obscurely 

 reticulate inner faces. 5. K. calif arnica. 



Plant densely hirsute ; petals 5-6 mm. long ; beak slightly shorter 

 than the body. 

 Sepals subulate ; leaflets elliptic or lance-elliptic. 6. K. hirsulissima. 



Sepals broadly lanceolate ; leaflets broadly oval. 7. A', canescens. . 



Beak of the fruit longer than the body of the fruit, columnar, scarcely 

 thickened at the base. 

 Petals 5-7 mm. long ; peduncles equaling or longer than the subtend- 

 ing leaves ; stem usually ascending with long internode. 8. K. parviflora. 

 Petals 7-10 mm. long ; peduncles shorter than the subtending leaves ; 

 plant spreading with short internodes. 9. A', intermedia. 

 Flowers showy ; petals 10-25 mm. long. 



Leaflets 3-5 pairs ; beak somewhat conic at the base, scarcely twice as long 

 as the body of the fruit. 

 Pedicels 2-3 cm. long ; sepals at least three fourths as long as the fruit ; 



petioles shorter than the leaflets. 10. A". Rosei. 



Pedicels 4-S cm. long ; sepals about half as long as the fruit ; petioles 



fully as long as the lowest pair of leaflets. 11. A', longipes. 



Leaflets 5-9 pairs; beak filiform-columnar, not thickened at the base, 

 fully twice as long as the body of the fruit. 12. K. grandiflora. 



1. Kallstroemia maxima (L.) T. & G. Fl. X. Am. 1 : 213. 1838. 



Tribalus maximus L. Sp. PL 3S6. 1753. 

 Tribulus trijugatus Nutt. Gen. 1 : 277. 1818. 

 Tribulus decolor Macfad. Fl. Jam. 186. 1837. 



A diffusely branched annual ; stem prostrate or procumbent, 3-6 dm. long, more orless 

 appressed-pubescent and with some hirsute hairs, becoming glabrate, succulent ; stipules 

 linear-subulate, 5 mm. long, persistent ; petioles shorter than the leaflets ; leaves 3-5 cm. 

 long ; leaflets 3-4 pairs, obliquelj" oblong or oval, somewhat falcate, obtuse or rarely acutish, 

 apiculate, more or less appressed-pubescent, 5-20 mm. long, the terminal pair usually the 

 largest and strongly directed forward ; peduncles 1^1 cm. long ; sepals lanceolate, acu- 

 minate, scarious-margined, ciliate and pubescent, conspicuously shriveled in fruit, per- 

 sistent ; petals yellow, fading darker, obovate, 7-8 mm. long ; fruit glabrous, the beak 

 conic at the base, slightly if at all longer than the body, 4-5 mm. long ; carpels 10, tubercu- 

 late and cross-ridged on the back, usually reticulate on the faces. 



Type locality : Jamaica. 



Distribution: Georgia to Florida, West Indies, Mexico, Central America, and Panama ; also 

 in tropical South America. 



Illustrations : A. Gray, Gen. 111. 2 : pi. 146 ; Jacq. Ic. pi. 462; Plum. PL Am. Burtn. pi. 254 ; 

 P. Br. Hist. Jam. pi. 21, f. 3 ; Lam. Tab. Encyc. pi. 346, f. 2. 



2. Kallstroemia caribaea Rydberg, sp. now 

 A branched annual ; stems diffuse or ascending, 3-5 dm. long, striate, finely pubescent 

 and sparingly hirsute ; stipules lanceolate, 3 mm. long; leaves 3-5 cm. long; petioles 

 shorter than the leaflets ; leaflets usually 3 pairs, 1-2 cm. long, obliquely elliptic or oval, 

 rounded and mucronate at the apex, more or less appressed-pubescent or glabrate above, 

 the pairs nearly of the same size; peduncles in fruit 1.5-3 cm. long; sepals narrowly linear- 

 lanceolate, hispid, 5 mm. long; petals yellow, obovate, 6-7 mm. long ; fruit grayish-strigose ; 

 beak 4 mm. long, conic at the base, about equaling the carpels ; nutlets tuberculate on the 

 back and reticulate on the faces. 



Type collected on Coconut hill, in cotton patches, Montserrat, West Indies, February 5, 1907, 

 J. A.'Sha/erjSS (herb. N. Y. Bot. Gard.). 



Distribution : Lesser Antilles, Costa Rica, and Honduras ; also in Colombia and Venezuela. 



