272 
MICRANTHI. 29. 
Flowers very small, mostly 3-8 mm. long (12-15 mm. 
long in the Pringlei group, in Madrensis and ervoides), 
in heads, or spikes, or rarely in short racemes, nearly 
always reflexed. Calyx about campanulate, 1-3 mm. 
long. Pedicels very short. Bracts small. Pods oblong 
to linear, little arched but always oblique, small, 4-12 
mm. long, 2-celled (imperfectly so in Purpusi), trique- 
trous to reniform in cross section, not inflated or but little 
so, papery to chartaceous, sessile or minutely stipitate 
(stipitate in A. Purpusi), rounded to notched at base, 
sharply acute (merely apiculate in Seatoni), sulcate dor- 
sally, ventral suture raised and thickened. Woody 
rooted perennials (possibly annual in A. Pringlei) with 
slender stems, either short and cespitose or long and 
widely spreading, rarely erect. The Mexican species of 
this group are poorly known and arrangement and spe- 
cies are only tentative. 
KEY. 
À. Flowers few and in racemes. 
AB. Pods much laterally flattened, with ventral suture the more 
Pig and tip conspicuously declined, nearly oval, 4-5 mm. 
ong. 
Pods woolly, covered by the leaves. 243 lentiformis. 
A2B. Pods very broad or obcompressed in cross section, oblong 
to linear, arcuate, about 1-1.5 cm. long. Flowers purple- 
tipped, broad. Calyx campanulate. Peduncles slender, 5-10 
cm. long. Leaflets elliptical, rounded or barely acute. Stems 
slender from a woody root. Stipules small. 
Pedicels evident. 
Foliage ashy. 244 Madrensis. . 
Foliage nearly smooth. 245 ervoides. 
Pedicels almost none. ' X 
Pods 1-2 cm. long. : 246 Greggih 
Pods 7-10 mm. long. 247 Luisianus. 
2A. Flowers in heads. . 
2AB. Flowers and pods reflexed in dense heads at the ends of 
filiform peduncles. Calyx turbinate-campanulate, the tube 
about 1 mm. long. Flowers 4-5 mm. long, broad. Pods 
about 8 mm. long and 2 mm. high, laterally flattened, very 
obtuse. 
Internodes elongated and stems almost filiform, 248 Pueble. 
2A2B. Flowers ascending, few, in loose heads. Calyx campanu- 
late. Pods apiculate or very short-pointed, not reflexed. Flow- 
ers narrow, 7-12 mm. long. Banner oblong-ovate. Wings 
about 1 mm. wide. Calyx tube about 3 mm. long. Pubescence 
/. ashy and minute. i 
0.5 Pods oblong, 7-10 mm. long. 249 Pringlei. 
u. O A |. 250 parvus. 
