Part 4, 1924] 



POLYGALACEAE 



309 



Aril distinctly 3-lobed, the dorsal lobe spreading, 

 3-toothed at apex. 

 Wings 4.5-5.8 mm. long. 



Wings suborbicular, glabrous except for the ciliolate 

 margin and the finely puberulous costa; sepals 1-2 

 mm. long. 

 Wings oval, pubescent at least along costa; sepals 

 2-3.8 mm. long 

 Dorsal margin of aril strongly descending; umbo 

 medium or large. 

 Hairs of stem all incurved. 

 Hairs of stem partly short and incurved, partly 

 long and spreading or ascending. 

 Dorsal margin of aril horizontal or erectish; umbo 

 minute. 

 Leaves lanceolate; dorsal margin of aril hori- 

 zontal. 

 Leaves broadly ovate; dorsal margin of aril 

 obliquely erectish. 

 Wings oblong, oblong-oval, or obovate-oblong, from nearly twice 

 to four times as long as wide. 

 Wings 6.5 mm. long or less. 



Wings very narrowly oblong, 1.2-1.8 mm. wide, pubescent 



nearly all over outside with spreading hairs. 

 Wings broader, pubescent chiefly along costa. 



Wings sparsely long-hairy dorsally; leaves lance-elliptic 



to linear. 

 Wings incurved-puberulous along costa and toward apex ; 

 leaves ovate or lance-ovate. 

 Seed glabrous; aril cloak-like, 1.1 mm. high, clpsely 



investing seed. 

 Seed pubescent; aril umbrella-shaped, 3.2 mm. high, 

 loose, with erectish dorsal margin. 

 Wings 7-10 mm. long. 



Leaves with numerous long straight spreading hairs on veins 

 beneath, some shorter and incurved hairs usually 

 intermixed. 

 Stem-hairs distinctly biform, some short and incurved, 

 some long and spreading; wings sparsely puberulous 

 at apex and base and along costa. 

 Stem-hairs less distinctly biform, the shorter ones some- 

 what spreading, the others not much exceeding them 

 in length; wings rather densely spreading-pilose along 

 costa and toward apex. 

 Leaves with hairs of veins beneath nearly all incurved or 

 appressed. 

 Aril strongly lobulate. 

 Aril somewhat 4-angled but subentire. 



V. Adenophora 

 Leaves obovate. 



Leaves incurved-pubescent. 



Leaves nearly glabrous. 

 Leaves linear to oblong-lanceolate. 



VI. Biloba 

 Lower sepals glabrous; flowers purple; racemes many-flowered. 



Bracts deciduous, equaling the pedicels; stems canescent-pilosulous. 

 Bracts persistent, shorter than the pedicels; stems incurved- 

 pubescent but green. 

 Lower sepals ciliate; flowers greenish; racemes 1^4-flowered. 



VII. Huateca 

 A single species. 



VIII. Hebeclada 

 Flowers large, the wings 7.5-14 mm. wide; shrubs, with comparatively 

 large ovate leaves. 

 Sepals densely ciliat e or ciliolate. 

 Wings densely ciliolate. 



Branches of inflorescence puberulent to densely strigose. 

 Seed pilose-tomentose; capsule 8 mm. long. 10 mm. wide. 

 Seed gray-pilose, not tomentose; capsule 7 mm. long, 

 7.5 mm. wide. 

 Branches of inflorescence subtomentose. 

 Wings glabrous or minutely glandular-ciliolate. 

 Wings 12-15 mm. long. 

 Wings 8-9 mm. long. 



58. P. anlUUnsi. 



59. P. brachysepala. 



60. P. microtricha. 



61. P. Hayesii. 



62. P. chiapensis. 



63. P. consobrina. 



64. P. hebanlha. 



65. P. Irichoptera. 



66. P. guatemalensis. 



67. P. Durandi. 



P. biformipilis. 



69. P. panamensis. 



70. P. costarkensis. 



71. P. isotricha. 



72. P. glandulosa. 



73. P. phoenicistes. 



74. P. macradenia. 



75. P. Purpusii. 



76. P. Conzattii. 



77. P. Parryi. 



78. P. lehuacana. 



79. P.floribunda. 



80. P. sphaerospora. 



81. P. Securidaca. 



82. P. apopetala. 



83. P. hovdurana. 



