116 CONTRIBUTIONS FROM THE NATIONAL HERBARIUM. 
PENNSYLVANIA: Pocono Mountains, Monroe County, Traill Green, July 16, 1857; 
same station, Britton, July 26, 1893. 
Minnesora: Near Minneapolis, Sandberg, September 17, 1891. 
3. Sium heterophyllum Greene, Pittonia 2: 102. 1890. 
**Roots fusiform-thickened below the middle; stem stout, notably 
angular and flexuous, 3 feet high; lowest leaves with a simple lamina 
which is rather broadly rhombic-lanceolate, serrate, or laciniate-cleft, 
and 2 to 10 inches long, supported on a stout fistulous petiole; the 
later radical 3-lobed or divided and passing to the truly pinnate, which 
have but 2 pairs of broadly lanceolate acute serrate leaflets; the bracts 
of the involucre broadly lanceolate, tapering at both ends; fruit 14 
lines long, strongly ribbed.” 
Type locality, ** brackish marshes near Suisun, California,” where 
it is associated with Cieuta bolanderi. 
“Tt is always aquatic, and as compared with S. cicutaefolium, in which the lowest 
leaves are the most dissected, reverses the order of leaf development.’’ We have 
not seen this plant. 
34. BERULA Hoftm. in Bess. Enum. Pl. Volh. 44. 1891. 
Calyx teeth minute. Fruit flattened laterally, nearly round, emar- 
ginate at base, glabrous. Carpel 
nearly globose, with very slender 
inconspicuous ribs, thick corky peri- 
carp, and no strengthening cells. 
Stylopodium conical. Oil tubes 
hnumcrous and contiguous, closely 
h surrounding the seed cavity. Seed 
terete. 
Smooth aquatic perennial, with 
simply pinnate leaves and variously 
cut leaflets, usually conspicuous involucre and involucels of narrow 
bracts, and white flowers. 
A monotypic genus based on Stum erectum Huds. of the north tem- 
perate regions of both hemispheres. 
Fic. 32.—Berula erecta: a, b, x 10. 
1. Berula erecta (Huds.) Coville, Contr. Nat. Herb. 4:115. 18938. 
Fig. 32. 
Sium erectum Huds. Fl. Angl. 108. 1762. 
Sium angustifolium L. Sp. Pl. ed. 2. 2:1672. 1763. 
Berula angustifolia Mert. & Koch, Deutsch. Fl. 2:483. 1826. 
Krect, 1.5 to 9 dm. high or even smaller; leaflets 5 to 9 pairs, linear 
to oblong or ovate, serrate to cut-toothed, often laciniately lobed, 
sometimes crenate, 1 to 7.5 em. long; umbel many-rayed; rays 5 cm. 
long or less; pedicels 4 to 6 mm. long; fruit scarcely 2 mm. long. 
Type locality not given, 
