368 ORDER LXVIII. COMPOSITE. 



obovate, slightly serrate ; cauline leaves sessile, scattered, oblong-lan- 

 ceolate, the lower ones similar to the radical. Flowers 3 — 5, terminal, 

 central one the largest; involucre leaves in a double series, linear-lan- 

 ceolate; ray florets linear; disk florets yellowish. Seed compressed, 

 nearly glabrous; receptacle somewhat convex, dotted. — Pale blue. If. 

 March — April. Common. 1 — 2 feet. Robin's Plantain. 



3. E. strigo'sum, (Muhl.) Stem pubescent, slightly scabrous. Radical 

 leaves linear-lanceolate, denticulate ; cauline ones long, linear, entire. 

 Flowers in a terminal panicle ; involucre with subulate leaves, pubes- 

 cent ; ray florets 2 — 3-cleft at the summit. Seeds hispid ; exterior pap- 

 pus minute scales, interior wanting, or a few pilose rays; disk florets 

 yellow. — White. 2{. May — Aug. Common in sandy pastures. 2 — 3 

 feet. 



4. E. ambiq'uum, (Nutt.) Stem erect, pubescent, somewhat scabrous. 

 Leaves linear, lower ones serrulate. Flowers usually in pairs, axillary 

 and terminal ; involucre hemispherical. — Yellow. If. Julv — Aug. 

 Middle Geo. 1—2 feet. 



5. E. Philadel'phicum, (L.) Stem pubescent, slightly furrowed. 

 Radical leaves cuneate, obovate, sometimes incisely toothed ; cauline 

 leaves oblong-lanceolate, amplexicaul, entire. Flowers in loose co- 

 rymbs; ray florets capillary, numerous; involucre many-leaved, with 

 the leaves arranged in two series, subulate. — White or pale purple. 1(. 

 Feb. — June. Common. 1 — 2 feet. 



6. E. quercifo'lium, (Lam.) Stem pubescent. Radical leaves lyrate 

 and coarsely toothed ; cauline ones entire. Flowers few, terminal; ray 

 florets numerous ; involucre with numerous subulate leaves. — Pale 

 blue or white. If. July — Aug. Middle Car. 8 — 12 inches. 



7. E. Canaden'se, (L.) Stem hispid, paniculately branched. Leaves 

 linear-lanceolate, narrow, ciliate. Flowers in racemose panicles ; invo- 

 lucre cylindrical, with acute linear leaves ; ray florets numerous, short, 

 capillary; disk florets 4-cleft. Seeds somewhat hairy ; pappus simple, 

 pilose. — White. 0. June — Sept. Common. 1 — 8 feet. 



8. E. pusil'lum, (Nutt.) Stem glabrous, slender. Leaves linear-lan- 

 ceolate, entire, with scabrous margins. Flowers in simple panicles, 

 with divaricate branches; involucre with narrow, acute leaves; ray 

 florets numerous, capillary ; pappus simple. — White. 0. July — Sept. 

 Common. 6 — 8 inches. 



The two preceding species, we think, ought certainly to constitute a distinct genus, 

 And we might add several varieties of these, differing from each other in a greater or 

 less degree. 



Genus XVIII. —D.1PLOPAPTUS. Cass. (Aster of Ell.) 

 (From diploos, double, and pappus.) 



Heads many-flowered; rays 8 — 12; disk tubular, perfect; 

 scales of the involucre imbricate, subulate, lanceolate. Recepta- 

 cle Hat. Pappus double ; interior of scabrous bristles, exterior 

 very short. 



1. D. linariifo'lius, (Hook.) (Chrysopsis linariifolia, Nutt.) Stem 

 erect, pubescent when young. Leaves numerous, linear, mucronate, 

 scabrous, rigid. Flowers in umbellate corymbs, with one at the ex- 

 tremity of each branch; involucre imbricate; scales numerous, linear 



