PLATE I. Eschwerlera calyculata Pittier. 220.000.000.000 000000022 97 
Il. Eschweilera calyculata Pittier...........2.0000000.022-0222-20--- 97 
IL]. Fruit of Eschwetlera collinsii Pittier.......... ote eee cece cceee® 98 
IV. Couroupita guianensis Aubl.............-- wee cece cece cee eeeees 99 
V. Couroupita guianensis Aubl.................20 00200202 99 
VI. Pyxidium of Lecythis costaricensis Pittier................ bee e sees 100 — 
VII. Pyxidia of Lecythis costaricensis Pittier................2.02...... 100 
VIII. Seeds of Lecythis costaricensis Pittier..............0..0...20.2.-. 100 
IX. Tonduzia stenophylla (Donnell Smith) Pittier................... 104 
X. Sapium pleiostachys Schumann & Pittier...............02...... 164 
XI. Sapium anadenum Pittier.............0.000020220220002020-2-.-2-. 164 
XII. Sapium mericanum Hemsl................2222---------------- 165 
XIII. Sapium thelocarpum Schumann «& Pittier....................... 166 
XIV. Sapium pedicellatum Huber...................----.---2-0200--- 166 
XV. Sapium pittiert Huber ...................-.22000002 02-00 167 
XVI. Sapium pachystachys Schumann & Pittier.....................-. 168 
XVII. Sapium oligoneurum Schumann & Pittier....................... 168 
XVIII. Myginda eueymosa Loesener & Pittier..........0.0.2..00.0.2.... 175. 
XIX. Carpotroche platyptera Pittier................2-------.--0002... 178 
XX. Beaucarnea goldmanti Rose........-....-.-0--5--5-0 00-0. 261 
XXI. Pilostyles thurberi A. Gray... 2.220202 0 22 ee 265 
XII. Mozinna pauciflora Rose........-........---5---22-----5-------- 282 
XXII. Echinocactus palmeri Rose... 2.2.2... 000 20202-2022 290 
XXIV. Opuntia azurea Rose...........0..-00-0-5-0-00000 00020 291 
XXV. Opuntia lloydit Rose.............-2---..-0-0--0-000 000022222 292 
XXXVI. Opuntia pyriformis Rose. ..........------------00-0-0---2222---- 292 
XXVIT. Opuntia vilis Rose... 22.2.2... -2-2-00-0-5-0-0--5--5---- 2222 .. 293 
XXVIII. Abronia insularis Standley....................0---.-----02000-- 312 
XXIX. Abronia acutalata Standley and A. minor Standley ...........-. 312 
XXX. Abronia breviflora Standley. ................0.0.000 2022-2 312 
XXXI. Abronia variabilis Standley and A. sparsifolia Standley......... 314 
XXXII. Abronia neurophylla Standley...............0.0 00000000 ee eee 314 
XXXIII. Abronia platyphylla Standley................0.0.-0.-.20220000..--.. 314 
XXXIV. Abronia covilleti Heimerl........-.-.....-2...-..-5.-------------- 316 
XXXV. Abronia bigelovti Heimerl....................--.----5-------22-- 317 
XXXVI. Abronia eralata Standley and A. turbinata Torr.................. 318 
XXXVII. Abronia arizonica Standley and A. lobatifolia Standley.......... 319 
XXXVIII. Abronia torreyi Standley. ................-.--.-.-2---------05- 320 
XXXIX. Abronia ramosa Standley. ...............-.-.--.----2---------- 321 
XL. Abronia glabrifolka Standley and A. orbiculata Standley ........ 321 
XLI. Abronia nealleyi Standley and A. terana Standley ............-. 323 
XLII. Abronia robusta Standley. ...............222...-.2-2-----.2.2-. 324 
ILLUSTRATIONS. 
PLATES. 
Facing page. 
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