AMMIACEAE. 



Vol. II. 



2. Sanicula gregaria Bicknell. Clustered 

 Snake-root. Fig. 3101. 



5". gregaria Bicknell, Bull. Torr. Club 22 : 354. 1895. 



Stems erect, weak, usually clustered, i°-3° 

 high, umbellate-branched, the branches slender. 

 Leaves thin, bright green, S-divid'ed; segments 

 stalked, obovate-cuneate to lanceolate, acute or 

 acuminate, doubly serrate with bristle-tipped 

 teeth, sharply incised, mostly less than 3' long; 

 basal leaves numerous, those of the stem only 

 1-2, petioled; involucral leaves large, 3-parted, 

 those of the involucre foliaceous ; pedicels of 

 staminate flowers i"-ii" long, 3 or 4 times the 

 length of the minute campanulate calyx; calyx- 

 lobes ovate, obtuse ; petals yellowish, much sur- 

 passing the calyx; anthers bright yellow; fruit 

 stipitate, broadly obovoid, ii"-2" long, the 

 slender styles recurved; bristles weak, very 

 small; oil-tubes 5, small; seed not furrowed. 



In moist woods and thickets, New Brunswick and 

 Ontario to Minnesota, Georgia, Nebraska and Arkan- 

 sas. May-June. 



3. Sanicula canadensis L. Short-styled Snake- 

 root. Fig. 3102. 



Sanicula canadensis L. Sp. PI. 235. 1753. 



S. marylandica var. canadensis Torr. Fl. U. S. 302. 1824. 



Rather dull green, i°-4° high, widely branched, 

 the branches forked, the umbellate fruit-bearing 

 rays only i"-s" long. Stem leafy; leaves petioled, 

 3-5-divided ; segments cuneate-obovate to narrowly 

 oblong, acute, mucronate-serrate, or incised, often 

 small, but sometimes 3i' long; involucral leaves 

 small, those of the involucels bract-like; staminate 

 flowers few, on pedicels l" long or less; calyx i" 

 long, parted into linear-lanceolate acute lobes which 

 exceed the minute white petals ; fruit short-stipitate, 

 subglobose, i"-2i" long; the bristles slender; styles 

 short, included; oil-tubes S! seed dorsally furrowed. 



In dry woodlands. New Hampshire to Florida, South 

 Dakota and Texas. June-Aug. 



Sanicula Smallii Bicknell, with yellowish or greenish 

 petals, the styles about as long as the calyx-segments, is 

 a related southern plant, ranging north to Missouri and 

 North Carolina. 



4. Sanicula trifoliata Bicknell. Large- 

 fruited Snake-root. Fig. 3103. 



.5". trifoliata Bicknell, Bull. Torr. Club 22 : 359. 1895. 



Stem slender, i°-2i° high, the branches alter- 

 nate, the lower often nearly erect, simple or 

 forked into numerous branchlets ; umbels of 3-5 

 often irregular rays 4"-i2" long, leaves rather 

 bright green, thin, slender-petioled, 3-divided, the 

 lateral segments often cleft; segments stalked, 

 broadly ovate, or obovate, or the lateral ones 

 rhomboid, acute, coarsely doubly serrate, or 

 incised, the teeth spinulose-cuspidate ; staminate 

 flowers few, on slender pedicels about 2" long; 

 calyx i" long, its linear rigid lobes incurved, sub- 

 ulate; petals white, about half as long as the 

 calyx ; styles short, included ; fruit 3" long, or 

 more ; larger oil-tubes 2, with numerous minute 

 ones ; seed not sulcate. 



In hilly woods, Maine to Ontario, southeastern New 

 York, West Virginia and Indiana. June-July. 



