868 OKDEK LXVIIJ.^ COMPOSITE. 



obovate, slightly sei-i-ate ; cauline leaves sessile, scattered, oblong-lan- 

 ceolate, the lower ones similar to the radical. Flowers 8 — 5, terminal, 

 central one the largest ; involucre loaves 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. Rohiiis Plantairi. 



8. 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. If. May — Aug. Common in sandy pastures. 2 — 3 

 feet. 



4. E. ambig'uI'M, (Nutt.) Steyn erect, pubescent, somewhat scabrous. 

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

 and terminal ; involucre hemispherical. — Yellow. 71. Julv — Aug. 

 Middle Geo. 1—2 feet. 



6. E. Phlladel'phicum, (L.) Stem pubescent, slightly furrowed. 

 Radical leaves cuneate, obovate, sometnnes incisely toothed ; cauline 

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

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

 the leaves arranged in two series, subulate. — "White or pale purple, i;. 

 Feb. — June. Common. 1 — 2 feet. 



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

 and coarsely toothed ; cauline ones entire. Floicers 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. ©. June — Sept. Common. 1 — 8 feet. 



8. E. pusil'lum, (Nntt.) 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 ; |>appus simple. — White. %. July — Sept. 

 Common. G — 8 inches. 



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

 and we miglit add several varieties of these, differing from each otlier in a greater or 

 le.^s degree. 



Genus XVllL— DIPLOPAP'PUS. 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 fiat. Paj^pus double ; interior of scabrous bristles, exterior 

 very short. 



1. D. linauiifo'lius, (Hook.) {Chrysopsis linariifoUa, Is'utt.) Stem 

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

 ecabrous, rigid. Floivers in umbellate corymbs, with one at the ex- 

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



