466 COMPOSITE. Lampsana. 



192. Crepis. Pappus in two or more series, soft, slightly scabrous. Achenia 



columnar, fusiform, or obscurely pointed. 



193. Troximon. Pappus copious and unequal, in several series, rigid. Achenia 



oblong-lineeir, scarcely or not at all rostrate. Acaulescent, simple. 



+- +- Achenia terete, ribbed or angled, with a long filiform beak. 



194. Macrorhynchus. Involucre imbricated. Achenia with about 10 ribs or 



callous wings, smootli. Acaulescent. 



195. Taraxacum. Involucre double, in 2 series. Achenia striate-angled, usu- 



ally muricate. Acaulescent. 



196. Pyrrhopappus. Involucre double, in 2 series, the exterior of spreading sub- 



ulate scales. Achenia scabrous. Caulescent or acaulescent. Pappus 

 reddish or fulvous. 



^- +• -t- Achenia flattened, either compressed or obcompressed. 



197. Lactuca. Achenia obcompressed, flat, abruptly produced into a filiform 



beak. Pappus very soft and white. 



198. MuLGEDiuM. Achenia compressed, tapering into a short or thick (sometimes 



indistinct) beak. Pappus bright white or tawny. Flowers blue. 



199. SoNCHUs. Achenia compressed, not rostrate. Pappus exceedingly soft and 



delicate, bright white. Involucre becoming tumid at the base. Flowers 

 yellow. 



Subtribe 1. LampsanejE, Less. — Receptacle not chaffy. Pappus none. 



177. LAMPSANA. Tourn. ; Juss. gen. p. 168 ; DC. prodr. 7. p. 76. 



Lapsana, Linn. ; Geertn. fr. t. 157. 

 Heads 8-12-flowered. Scales of the cylindrical-campanulate angled 

 involucre 8, erect, in a single series, bracteolate with one or two minute 

 scales. Receptacle narrow, naked. Achenia oblong, glabrous, obscurely 

 striate, caducous, destitute of pappus. — Slender branching herbs (natives of 

 the old world), with angulate or toothed leaves, and small loosely paniculate- 

 corymbose beads. Flowers yellow. 



1. L. communis (Linn.) : annual, somewhat glabrous ; lower leaves ovate, 

 angulate-toothed, petioled, sometimes lyrate ; involucre very glabrous, near- 

 ly equalling the flowers. — Fl. Dan. t. 500 ;. Engl. hot. t. 844 ; Schkuhr, 

 handb. t. 225 ; Hook. ! fl. Bor.-Am. 1. p. 296. 



Lower Canada, Mrs. Sheppard ! Mrs. Perdval ! Probably introduced 

 from Europe. — Mr. Oakes once found this plant by the roadside in Cam- 

 bridge, Massachusetts. 



178. APOGON. Ell. sk. 2. p. 267; DC. prodr. 7. p. 78. 



Heads 10-20-flowered. Scales of the involucre mostly 8, somewhat in two 

 series, ovate, acuminate, nearly as long as the corolla, connivent in fruit. 

 Receptacle naked. Achenia obovoid -oblong, terete, longitudinally ribbed, 

 and marked with very minute transverse striatures, glabrous. Pappus none ! 



