96 Contributions from the Gray Herbarium 
coma). Aril 2-lobed, appressed, 0.5 mm. long. — HBK. Nov. Gen. 
v. 397. t. 509 (1821); Chod. Monog. ii. 180. t. 21. f. 37-38 (1893). 
P. Nelsonii Rose, Contr. U.S. Nat. Herb. x. 122. t. 38 (1906). — 
Divisible into two color forms. 
Forma typica. Flores purpurei. — Vera Cruz: dry meadows, 
Zacuapan, Aug. 1906, Purpus 2074 (G); Mirador, Liebmann 15 
(K). Mexico without locality: Haenke G). British HonpuRAS: 
open ground, near Manatee Lagoon, 27 Sept. 1905, M. E. Peck 147 
(G). Honpuras: Stann Creek, 13 April, Rev. J. Robertson 194 (B). 
Forma leucanthema. Flores albi. — Vera Cruz: Salina Cruz, 
22 Dec. 1898, C. C. Deam 99 (TYPE: G).— T. 2. Fig. 72, 72a. — 
Deam 99 ,in addition to being white-flowered, differs in its consider- 
ably smaller flowers (the minima in the measurements above), but 
agrees in all technical characters with Purpus 2074. P. variabilis 
has been confused with P. trichosperma L., but differs in its longer 
aril-lobes, those of P. trichosperma being very minute. 
Ser. e. Tenures Chod. Slender annuals, the linear leaves alter- 
nate throughout or sometimes opposite or whorled below; racemes 
very slender, the flowers tiny; seed glabrous or sparsely short- 
pubescent with straight hairs, never comose. — Polygala sect. 
Orthopolygala subsect. I. H. Tenwes Chod. Monog. ii. 214 (1893). 
a. Pigg: glabrous; aril very minute, b. 
emes white, very cc bracts penne fia 119. fs ie ees 
° Racemes looser, pink; bracts deciduous............. 120 decidua. 
a. 
c. Plant eeroue 
d. Aril 
Aril 
pe 
c. Plant Lie pon Se aril }-3 as long as sie Pp eee 
119. P. Gracia Wats. Annual, erect, branched above, 9-21 
em. high, the almost filiform stems glabrous, not angled. Leaves 
(except 1-2 whorls of 3 obovate leaves at extreme base, 3-3.5 mm. 
long, 1.5-2 mm. wide) scattered, ascending, linear, cuspidate, 
gland-dotted, glabrous, subsessile, 2-7 mm. long, 0.3-0.6 mm. wide. 
Racemes very slenderly conic-cylindric, dense, 6-22 (axis becoming 
28) mm. long, 2-2.6 mm. thick, on peduncles 9-27 mm. long; 
pedicels 0.2 mm. long; bracts lance-subulate, bearing a large gland 
at base, 0.8 mm. long, spreading-ascending, persistent. Flowers 
white, 1.3 mm. long. Upper sepal oval, obtuse, lower ovate, acute, 
0.6 mm. long. Wings oblong-oval, rounded at apex, short-clawed 
