4 
62 BOTANICAL GAZETTE. | March, 
groups of strengthening cells; oil-ducts 25 to 30, with 8 to 
10 on the commissural side (fig. 18).— Archangelica atropur- 
purea Hofim. Umbel. 161; Gray, Manual, 193.—Low river- 
banks, from New England to Pennsylvania, Minnesota, and 
northward. Fl. June. , 
CAELOPLEURUM Ledeb.—Fruit globular-ovoid, round 
in section, or slightly flattened laterally: carpel with 5 very 
prominent thick corky primary ribs, about equal and none of 
them winged, each with a large group of strengthening cells: 
oil-ducts 1 in each interval, I (rarely 2) under each rib, an 
e 
plane or slightly concave on the inner face (fi S. 19, 20).—= 
Stout perennial, with I-3-ternately divided leaves, few- 
leaved involucre and involucels, and greenish-white flowers. 
Fl. July.—The genus is well marked by its fruit characters. 
It clearly differs from the whole group of Angelicez in the ab- 
sence of lateral wings, and in the fruit not being at all dor- 
sally flattened. The flattening, if any, is slightly lateral, as 
in Ligusticum. From Ligusticum it differs in its very large 
ribs and single oil-duct in each interval; from Selinum in 
that it has oil-ducts beneath the ribs as well as in the inter- 
vals. It was referred by Bongard to Pleurospermum, but 
the seed being mostly plane or very slightly concave. 
1. C. Gmelini Ledeb. Fl, Ross. 2.361. Stem 1-3 ft. high: 
leaflets ovate, acute, cut-serrate.—Archangelica Gmelint DC; 
Gray, Manual, 193. A. peregrina Nutt.—New England 
and northward, also in the Rocky Mountain region. 
L.—Fruit ovate-globose, slightly flattened 
shar rimary ribs and no 
t. #. Cynapium L. A fetid, poisonous European herb, in 
cultivated grounds, from New England and Pennsylvania to 
Minnesota. 4 
.. UM L.—Fruit ovate, flattened laterally: carpel 
with 5 prominent Wavy primary ribs. each ‘with & large 
