SMITH: STUDIES IN THE GENUS LUPINUS r 
ILLUSTRATIONS AND MEASUREMENTS 
The figures are mere outline representations of the dissected 
floral parts, mounted in water under cover-glass slips. The calyx 
is represented as seen from above, the upper lip having been 
pressed down to show its proportional relations to the lower lip. 
By this method, the interstitial bracteoles, if present, are not apt 
to be overlooked. One wing-petal is often added merely to show 
the extent or absence of the ciliation. The banner is flattened out 
sufficiently to get the measurements and show the shape of the 
apex and claw. The measurements, with necessary exception in 
a very few cases, were made from these dissected floral parts after 
same had been softened in boiling water and mounted for drawing. 
Key to the species of the Microcarpi 
Bracts subulate throughout, mostly stiff and not reflex-wither- 
ing, about 5-6 mm. long, little more than twice the length 
pedicels; flowers 9-11 mm. long. 1. L. malacophyllus. 
Bracts thant ladcoolake with a dilated thin base, mostly reflex- 
withering as the flower-buds open, at least the lower much 
longer than the pedicels; flowers 11-19 mm. long. 
Flowers ascending to suberect in anthesis. 
Banner 4-6 mm. wide; wings naked below and often 
above; calyx ebracteolate. 
Banner 7-11 mm. wide; wings and keel ciliate near the 
claw both below and above; calyx bracteolate. 3. L. horizontalis. 
Flowers spreading in anthesis. 
lowers soon becoming suberect after anthesis, not 
to 
. L. microcar pus. 
secund. 4. L. subvexus. 
Flowers spreading or —— secund after anthesis. i 
Plants 30-90 cm. tall, pend fibrous, often widely 
branched above; banner ovate; keel ensely ciliate 
at base both below vie shoes . aes crowded; 
seeds uniformly blackish brown, regularly tuber- 
] 5. L. luteolus. 
rarely ovate; keel usually naked near base below; 
but sometimes sparsely ciliate; verticels crowded 
or remote; seeds smooth or irregularly roughened. 6. L. densiflorus. nai 
1. LupINUS MALACOPHYLLUS Greene, Pittonia 1: 215. 1888. 
I quote from the original description as follows: 
al, erect, a span high, with a few ascending branches from the base; soft 
throughout, with a long white villous pubescence .. . . racemes verticillate, at 
di tai ONE NEN a RET 
* L. densiflorus and its varieties will be di 1 in the third paper of this series. 
