Studies in the genus Lupinus—X. The Micranthi concluded 
CHARLES PIPER SMITH 
(WITH TEXT FIGURES 92-94) 
My treatment of this group was introduced in the seventh 
paper of this series (Bull. Torr. Club 49: 204. 1922). The 
list of published names and combinations there given shows’ 
that at least nineteen proposed species, plus some seven “ined.” 
proposals, have called for consideration in the preparation of 
this review. Careful study of all these propositions, with the 
exception of one Mexican form, has now been completed, the — 
result being that just seven real species seem to stand the test 
given them. Six of these are indicated and contrasted in the 
following key. 
KEY TO THE SPECIES OF THE MICRANTHI 
ee velvety ee with short, spreading hairs; 
pods 8-10 mm. wide; seeds 
5- a mm. long 2. L. niveus. 
Loosely villous sad (or) a les or spread- 
ing pubescent, but not v 
Pedicels 3-8 mm. long; sate Re = mm. long, ban- 
ner suborbicular or wider than long; verticils four 
to several. 1. L. nanus. 
Pedicels 1-3 mm. long; flowers 5-12 mm. long; ver- 
ticils one to five 
Stems quite Gituinuk: flattening in the press 
flowers 8-10 mm. long, banner suborbicular or 
broader than long. 3. L. chihuahuensis. 
Stems more solid, not flattening in the press. 
Keel non-ciliate. 
Banner suborbicular or erm! haces 
about 8 mm. long; pods 6-9 mm. wide; 
seeds 4-5 mm. long by 3-3.5 mm. oe 5. L. pachylobus. 
Banner obovate, rhombic, or elliptic, 
longer than wide; flowers 5-7 mm. 
long; seeds 2-3 mm. long by about 
mm. wide. 6. L. bicolor. 
Keel ciliate on the free edges above, between 
middle and a 
Keel slender, with long, narrow acumen, 
nearly straight to much arcuate; ban- 
ner orbicular-obcordate, obovate, rhom- 
gI 
