876 AMMIACEAE 



pinnatelv compound, oblong or oblong-ovate in outline, 5-30 cm. long ; segments ovate or 



oblong, oblique, crenate-serrate, incised or lobed : umbels very variable, 5-20 cm. broad, 



flat : rays unequal, 1.5-5 cm. long : sepals obsolete : corolla yellow : petals about 1 mm. 



long, strongly revolute : fruit obovate, oval or orbicular-oval, 5-6 mm. long. 



In waste places and fields, common throughout the United States and southern British America. 

 Summer and fall. 



42. HERACLEUM L. 



Perennial caulescent herbs, with a heavy odor. Leaves alternate : blades ternately 

 compound ; leaflets broad, toothed or lobed. Flowers perfect, in compound umbels. In- 

 volucres and involucels of few often deciduous bracts or the former wanting. Hypanthium 

 truncate, or sepals small. Petals white, broadest above the middle, those of the outer and 

 inner flowers difierent in shape. Disk with a thick conic stylopodium. Fruit usually 

 longer than broad, strongly dorsally flattened : carpels with the dorsal and contiguous ribs 

 slender, and broadly winged lateral ribs, the latter nerved near the outer edge : oil-tubes 

 solitary in each interval, and 2-4 in the inner face, rarely extending beyound the middle of 

 the carpel. Cow Parsnip. 



1. Heracleum lanatum Michx. Heavy scented, more or less densely pubescent. 

 Stems stout, 6-25 dm. tall, often branched : leaf-blades ample, ternately divided, 1-4 dm. 

 long ; segments ovate to suborbicular, lobed, sharply serrate ; petioles with conspicuous 

 wing-like stipules : umbels 8-30 cm. broad, flat : bracts of the involucres mainly wanting : 

 rays 8-30, stout, 3-15 cm. long : pedicels 6-20 mm. long, rather slender at maturity : 

 corolla white : fruit oval or obovate-oval, 8-12 mm. long, minutely pubescent, emarginate 

 at the apex. 



In low ground, Labrador to Alaska, Georgia and California. Spring and summer. 



43. DAUCUS L. 



Annual or biennial caulescent herbs, with rough-pubescent foliage. Leaves alternate : 

 blades pinnately decompound. Flowers in spreading compound umbels. Involucres and 

 involucels various, or wanting : hypanthium truncate or nearly so. Sepals obsolete. Petals 

 white or rarely colored, often unequal, broadest above the middle, inflexed at the apex. 

 Disk often with a depressed or conic stylopodium. Fruit longer than broad, dorsally flat- 

 tened : carpels with 5 low primary ribs and 4 winged secondary ribs, which are armed with 

 a row of barbed bristles ; oil-tubes solitary under the secondary ribs and 2 in the inner face. 

 Carrot. 



Carpels broadest at the middle ; wings divided into 12 or more bristle-like prickles. 1. D. Carota. 



Carpels broadest below the middle ; wings parted into 1-8 flat prickles. 2. D. pusillus. 



1. Daucus Carota L. Bristly-hispid. Stem erect, 4-12 dm. tall, often branched, 

 channeled : leaf-segments acute or cuspidate, cleft or toothed : rays of the compound 

 umbel numerous : corolla white, a few in each umbel larger than the rest, the central one 

 often purple : petals very unequal, suborbicular, unequally cleft, crLsped : fruit 3-4 mm. 

 long, the carpels broadest at the middle, the wings divided into 12 or more bristle-like 

 prickles. 



In fields and waste places, nearly throughout North America ; except the extreme north and 

 south. Naturalized from Europe and Asia. Spring to fall. 



2. Daucus pusillus Michx. Hispid. Stem erect, 1-8 dm. tall : umbels long- 

 peduncled : rays several or numerous, 1-2 cm. long, nearly equal : corolla white, or the 

 central one larger and purple : fruit ovoid-oblong, 3-4 mm. long, the wings parted into 

 1-8 flat prickles. 



In fields and waste places, "Virginia and British Columbia to Florida and California. Spring to fall. 



Series 2. GAMOPETALAE. 



Petals partly or almost wholly united, or occasionally distinct, or 

 very rarely wanting. 



Order 1. ERICALES. 

 Herbs, undershrubs, shrubs, trees, or sometimes humus-plants or sapro- 

 phytes. Leaves alternate, often evergreen, often reduced to scales : blades com- 

 monly leatherj\ Flowers mainly perfect and complete, regular or nearly so. 



