PENTANDRIA, DIGYNIA. 
141 
137. SIUM. Gen. pi. 480. {Umbellifers.') 
Calix obsolete. Petals cordately inflected. 
Fruit sub-obovate, laterally compressed, 
and striate. 
1. S. leaves pinnate, leaflets oblong-lanceolate, latiroimm. 
equally serrate. — Smith. 
From three to four feet high. Stem hollow. Flowers white. 
Very common on the marshy shores of the Delaware and 
Schuylkill, and other waters in our neighbourhood. Perennial. 
July, August. 
2. S. leaves pinnate, folioles long, sub-lanceolate- hneare. 
linear, remotely serrate, involucre few leaved, 
involucels linear, many-leaved, umbel shortiy 
radiated.^ — Mich. 
S. suave, Walt. 
S. longifolium, Pursli ? 
Along the shores of the Delaware and Schuylkill, and on 
the borders of ditches and rivulets, not uncommon. Peren- 
nial. July. 
138. MYRRHIS. Mich. {Umbelliferce.) 
Fruit sublinear, solid and angular, ridges a 
little acute, apex attenuated or crowned 
with the style. Universal involucruin 
none. — Sprengel. 
1. S. leaves ternate, folioles ovate-acute, some- canadensis, 
what incised ^ peduncles in pairs, fruit oblong. — 
Pers. 
Myniiis Canadensis, Riv. pentapet. 54 Sprengel, 
Plant. Umb. Prod. p. £8. 
Sison Canadense, L., Willd., Pursh, &c. 
Chserophyllum Canadense, Pers. 
Canadian Honey-wort. Chervil. 
About eighteen inches or two feet high. In shady woods, 
Very common. Perennial. July. 
