54 Field Columbian Museum Botany, Vol. 2. 



Phaseolus lunatus Linn. Sp. PI. 724. 



Thickets, spontaneous south of Charlotte Amalia, St. Thomas 

 (481) and at "The Ovens," Santiago de Cuba (1104). 



OXALIDACE.F. 



Oxalis Martiana Zucc. Denk. Ak. Muen. 9:144. 



O. bipanctata Grah. Rich moist soil of hillsides near Port Anto- 

 nio, Jamaica (11 30). Leaflets broadly ovate 3 x 4. 5 cm., emarginate> 

 punctato-glandular and hairy above and beneath, petioles 25 cm. 

 invested with long scattered hairs; scapes 35 cm. somewhat less cili- 

 ate than the petioles. Flowers violet-blue 1.5 cm., calyx lobes dis- 

 tinct, each furnished with a pair of oblong brownish glands approxi- 

 mate at the tip. 



Oxalis Berlandieri Torr. Mex. Bound. Surv. 41. 



Infrequent in the open woodlands about Chichen Itza, Yucatan 

 (1633). 



ZYGOPHYLLACE^E. 



Kallstroemia maxima Wight & Arn. Prod. 145. 



Tribulus L. Sandy spots in grassy fields at Catano, Porto Rico 

 (162, 336); suburbs of the city of San Domingo (779); margins of cul- 

 tivated fields Bodden Bay road, Grand Cayman (1342), and grassy 

 knolls, Merida, Yucatan. 



Tribulus Alacranensis sp. nov. Plate xlviii & Ixi. 



Perennial runner. Rootstock long and ligneous, stems many, 

 ligneous, thick (4-7 mm.) 20-24 striate, .5-2.5 meters long; branches 

 nude, ligneous, .5 to 1 meter long, many jointed, joints all about 1.5 

 cm. long, nodes rough with the withered persistent bracts and stipules 

 of deciduous leaf stems, branchlets infrequent along the branches, 

 mainly aggregated at the tips, very woolly with silvery down, interpet- 

 iolar bracts triangular, stipules linear, pointed (1 cm.), usually of the 

 length of the leaf stem from the axil to the first jugae. Leaf sensitive, 

 closing slowly but too quickly to be flat in the collecting papers, 3-5 

 cm. long, stem densely silvery-tomentose, leaflets 8-jugal densely 

 tomentose above and below, flowers all terminal, the peduncles 

 during anthesis the length of the leaves, but in mature fruit only 

 one half the length. Flowers bright chrome (Prang YYO) closing 

 early in the sun, about half the size of those of T. cistoides, anthers 

 twice the size. Pistil clothed with long, straight hyaline setae which 

 persist even on the fully ripe fruit. Ripe fruit about one-half the size 

 of that of T. cistoides, carpids truncate, somewhat tuberculate, median 

 ridge prominent, 4-6 spined, the main pair divergent, the apical pair 

 very short, the median pair situated near the commissure on the 

 median line of the margins, one or both spines of the median pair fre- 

 quently wanting. This species has probably developed its special 

 characters through its environment from a parentage in T. cistoides, 

 to which one of its leafy branches, if taken alone, will bear a close 

 gross resemblance; the whole plant, however, in its long, tangled^ 

 jointed, woody branches and mass growth, is clearly distinct. 



