FLORA OF THE GALAPAGOS ISLANDS. 157 



Charles Isl.: Andersson. Chatham Tsl. : Andersso?i (hb. Gr.). 

 Duncan Isl.: A. Agassiz (hb. U. S. Nat. Mus.). Gardner Isl. : 

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

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

 shorter style, etc., clearly distinct from K. maximus, Wight & Am, 

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

 recently characterized from the southwestern United States as Kallstroe- 

 mia bra.chyst.yKS) Vail, Bull. Torr. Club, xxiv. 206 (Tribuhis 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.). James 

 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 foliisque 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. & lib. U. S. Nat. Mus.). 

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

 to 200 m. alt., Snodgrass & Heller, nos. 163 (lib. 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. Agass : z ; Baur, no. 39 

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

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

 tris, L. 



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

 velvety-tomentose species with short internodes and geniculate stem. 

 The specimens are sterile and indeterminate. 



