282 AMBBOSIACEAE. 



1. L. cardinalis L. Stems 3-12 dm. tall, simple: blades of the lower leaves 

 oblong to oblong-spatulate, serrate or dentate: sepals linear to linear-subu- 

 late: corolla-lobes on either side of the cleft linear-oblanceolate : capsule hemi- 

 spheric, short-beaked: seeds mostly over 1 mm. long. Common, in moist 

 places and on creek-banks. Late sum. CARDINAL-FLOWER. 



2. L. syphilitica L. Stems 2-6 dm. tall, sparingly pubescent, often branched : 

 leaf-blades oblanceolate to elliptic or lanceolate, 2.5-20 cm. long, coarsely 

 serrate or sinuate- dentate : sepals bristly ciliate, acuminate from a broad 

 base, each with large acute basal auricles: corolla light-blue, or rarely white; 

 tube about 1.5 cm. long; lobes of the lower lip narrow, gradually pointed: 

 seeds wrinkled. Common, in meadows and along streams. Fall. GREAT- 

 LOBELIA. 



3. L. pubemla Michx. Stems 3-10 dm. tall, softly pubescent: leaf -blades 

 oblanceolate to obovate, oblong, lanceolate, or ovate, 2-10 cm. long, finely 

 toothed: sepals sometimes bristly, lanceolate, 7-9 mm. long, each with small 

 rounded basal auricles: corolla bright-blue; tube about 1 cm. long; lobes of 

 the lower lip broad, abruptly pointed: seeds tuberculate. S. Frequent, in 

 low grounds and thickets. Schists. Fall. 



4. L. spicata Lam. Stems 1-12 dm. tall, pubescent, at least near the base: 

 leaf-blades spatulate, obovate, or suborbicular at the base of the stem, ob- 

 lanceolate to lanceolate above, 1-10 cm. long, crenate- dentate or nearly entire: 

 sepals linear- subulate, 3-5 mm. long, not auricled at the base: corolla blue, 

 6-9 mm. long: capsules 2.5-3 mm. long. Common, in moist fields and 

 meadows. Sum. 



5. L. inflata L. Stems 1-10 dm. tall, pubescent: leaf -blades obovate to oval 

 or ovate, 2-9 cm. long, crenate: sepals linear, 2.5-3.5 mm. long, entire: corolla 

 lilac, 6-8 mm. long: capsules 5-8 mm. long, inflated. Common, in dry soil 

 and thickets. Sum. and fall. INDIAN-TOBACCO. 



6. L. Kalmii L. Stems 1-5 dm. tall, glabrous: basal leaves with spatulate 

 blades, upper cauline leaves narrowly linear, 1-4 cm. long, entire: flowers 

 slender-pedicelled : hypanthium turbinate, becoming obovoid and 5-6 mm. 

 long: sepals subulate or lanceolate-subulate, entire, 2.5-3 mm. long: corolla 

 light-blue, about 1 cm. long : capsules 6-7 mm. long. M. Bare, in the 

 Dillerville swamp, Lancaster. Limestones. Sum. BROOK-LOBELIA. 



Order CARDUALES. 



Herbs, shrubs, or rarely trees. Leaves mainly alternate : blades 

 entire, toothed, or divided. Flowers perfect, monoecious, or dioecious, few 

 or many aggregated on a receptacle and surrounded with an involucre or 

 the involucre rarely obsolete. Calyx 1 or 2 rows of bristles or scales, or a 

 mere border or a crown, or obsolete, or wanting. Corolla of several more 

 or less united petals or wanting. Androecium of usually 5 stamens, the 

 anthers converging or united. Gynoecium mostly of 2 united carpels. 

 Ovary inferior. Styles or stigmas mostly 2. Fruit an achene. 



Flowers with tubular corollas, or those of the outer ones prolonged into ligules. 



Stamens distinct, the anthers merely converging about the stigma. 



Stamens united by their anthers, thus forming a tube Fam. 1. AMBROSIACEAE. 



around the stigma, except in Kuhnia. Fam. 2. CARDUACEAE. 



Flowers with each corolla prolonged into a ligule. Fam. 3. CICHOEIACEAE. 



FAMILY 1. AMBROSIACEAE. RAGWEED FAMILY. 



Annual or perennial herbs, or woody plants, often weedy. Leaf- 

 blades entire, lobed, or divided. Flowers in inconspicuous heads, the bracts 



