FLORA OP THE GALAPAGOS ISLANDS. 157 



Charles Isl.: Andersson. Chatham Tsl. : Andejsson (hb. Gr.). 

 Duncan Isl,: A. Agassiz (hb. U. S. Nat. JNIus.). Gardnek Isl.: 

 Snodgrass & Heller, no. 615 (hb. Gr.). Hood Isl. : Snodgrass & 

 Heller, no. 756 (hb. Gr. ). Endemic. This species is by its much 

 shorter style, etc., clearly distinct from IC. maximus, Wight & Arn. 

 (^IVibulus maximus, L). It is, however, exceedingly close to the plant 

 recently characterized from the southwestern United States as Kallstroe- 

 mia brachystylis, Vail, Bull. Torr. Club, xxiv. 206 (Tribulus brachystylis, 

 Robinson, Syn. Fl, i. pt. 1, 354). The Galapageian plant, however, 

 differs from the continental in slightly more slender habit, smaller and 

 more unequal leaflets (usually 2 or 3 rather than 4 pairs), and more 

 enduring sepals which persist even at the maturity of the fruit. K, 

 brachystylis has been found in Mexico, but apparently not in S. America. 



Tribulus, L. 



T. ciSTOiDES, L. Sp. 387 (1753); Hook. f. (3), 231; Anderss. (1), 

 244, &, (2), 107. — Albemarle Isl.: Macrae. Charles Isl.: Snod- 

 grass & Heller, no. 400 (hb. Gr.). Hood Isl. : Snodgrass & Heller, 

 no. 743 (hb. Gr.). Indefatigable Isl.: Andersson (hb. Gr.). Jajies 

 Isl. : Darwin. Seymour Isl. : south, Snodgrass & Heller, no. 598 

 (hb. Gr.). Further distrib. general in warm and temperate countries. 

 ^ Var. anacanthus, nov. var. Formae typicae habitu foliis([ae similis; 

 floribus plus minusve minoribus ; petalibus 1-1.2 cm. longis ; fructus 

 carpellis vel tribus vel quatuor vel saepius omnibus ab aculeis omniuo 

 destitutis. — Albemarle Isl.: Lee (hb. Gr. & hb. U. S. ISTat. Mus.). 

 Tagus Cove, March, 1899, common near beach and on sandy hillsides up 

 to 200 m. alt., Snodgrass & Heller, nos. 163 (hb. Gr.), 165 (hb. Gr.), 

 & 915 (hb. Gr.). Endemic. 



^ T. SERiCEUS, Anderss. (1), 245, & (2), 107; Rob. & Greenm. (1), 

 145. T. servicens, var. humifusus, Rose, (1), 136. — Charles Isl.: in 

 lower arid region, Andersson (var. humifusus) ; A. Agassiz ; Baur, no. 39 

 (hb. Gr.). Chatham Isl. ; in lower arid region, Andersson (var. 

 erectus), (hb. Gr.). Endemic but too near the cosmopolitan T. tcrres- 

 tris, L. 



T. sp. — Culpepper Isl. ; Snodgrass & Heller, no. 3 (hb. Gr."). A 

 velvety-tomentose species with short internodcs aud geniculate stem. 

 The specimens are sterile and indeterminate. 



