208 
Plants 5-10 mm. high, seta 23 mm., exserted, capsule turbinate. 
5. Hookert. 
Plants 5-13 mm. high, seta 5-13 mm., mouth bordered by 6-8 rows. 
Leaves acuminate, entire, lid blunt, spores .014-.021 mm., spinose. 
6. acuminatum. 
Leaves acute, serrate, lid rostrate, spores .040-.045 mm., warty. 
7. Drummondit. 
Plants 20-30 mm. high, mouth bordered by 4-8 rows of cells, 
Stems tall, leafy, branching, seta curved, spores .037—.042 mm., warty. 
8. australe, — 
Plants 5-25 mm. high, mouth bordered by 8-12 rows of cells, spores .027-.035 mm. 
Margins serrate, cells inflated, spores spinose, annulus of two rows of cells. 
Capsules turbinate, I-2 mm., mouth flaring, 9. turbinatum. 
Capsules pyriform, 2-3 mm., urceolate, mouth not flaring, 
f 10, megalocarpum. 
Margins entire, cells elongated, spores warty, seers globose. ; 
11. Californicum. 
The Genus Cassia in North America.* 
By CHARLES LovuiIs POLLARD. 
Since the publication of Bentham’s ehoweBk in 1871, the oe 
genus Cassia has received no detailed treatment. The discovery — : 
‘of new material in the South and Southwest during recent years — 
renders a revision of the North American species desirable. The 
present paper enumerates only those forms which are known t0 
occur north of the Mexican boundary, the numerous tropical spe 
cies being reserved for later consideration. The classification into 
subgenera, sections and series is that of Bentham, with such modi- » 
fications as seemed necessary to adapt it to North American forms oe 
exclusively. a 
Analytical Key to the North American Species. 
Leaves with a spinulose rhachis, - 27. C. armata. 
Leaves with rhachis not spinulose. 
Leaves 2-9-foliolate. 
Peduncles 1-flowered. 
Leaves 2-foliolate, 2. C. pumilio. 
- * Submitted to the University Faculty of Pure Science of Columbia | ae as 
partial requirement for the degree of Master of Arts. 
___ ¥Trans, Linn, Soc. London, 27: 503-591. 
