]296 CARDUACEAE 



129. PECTIS L. 



Annual or perennial caulescent often heavy-scented herbs, usually glandular-dotted 

 and glabrous. Leaves opposite : blades narrow, entire, usually bristly ciliate. Heads 

 small, radiate, in cymes. Involucres narrow, several-flowered : bracts distinct, in 1 series, 

 keeled. Eeceptacle naked. Ray-flowers pistillate, fruit-producing : ligules broad. Disk- 

 flowers perfect : corollas sometimes 2-lipped. Anthers entire at the base. Stigmas of 

 the disk-flowers obtuse. Achenes narrow, terete or angled. Pappus of several scales, 

 awns or bristles, or rarely obsolete. Our species are annuals. 



Pappus of awn-tipped or subulate-tipped scales, 2-3 in the ray, 4-6 in the disk. 

 Heads sessile or nearly so : leaf-blades over 1 mm. wide. 



Ray-flowers 5 : achenes of the ray with 2 pappus-scales. 1. P. prostraia. 



Ray-flowers 2-3 : achenes of the ray with 3 pappus-scales. 2. P. ciliaris. 



Heads long-peduncled : leaf-blades less than 1 mm. wide. 3. P. Lessingii. 



Pappus of 1-6 upwardly barbed awns, or a mere chaffy crown. 



Pappus of 3-6 slender awns. 4. P. tenella. 



Pappus a scaly crown, sometimes accompanied by 1 or 2 awns. 5. P. angiistifolia. 



1. Pectis prostrata Cav. Foliage nearly glabrous. Stems usually branched at the 

 base, the branches procumbent or prostrate, 0.5-2 dm. long : leaf-blades oblanceolate to 

 linear-spatulate, 1-2 cm. long, entire, sparingly bristly near the base : heads sessile or 

 nearly so, more or less clustered : involucres prismatic, 6-7 mm. long ; bracts concave and 

 keeled: ray-flowers 5 : achenes 2-2.5 mm. long: pappus-scales ovate-lanceolate or lanceo- 

 late, often unequal, short-awned, 2 in the ray, 4-5 in the disk. 



In waste places, about seaports, Florida. Also from southern Texas to Arizona and Mexico. Also 

 jn the West Indies. 



2. Pectis clMris L. Foliage minutely pubescent, il/e/issa-scented. Stems 1-4 dm. 

 tall, erect or diil'usely branched : leaf-blades linear or nearly so, over 1 mm. wide, acute, 

 entire, with few bristles near the base : heads sessile or nearly so, few in clusters : in- 

 volucres prismatic, 4-5 mm. high ; bracts 4-6, linear or oblong : ray-flowers 2-3 ; ligules 

 2-2.5 mm. long : achenes slender, 3 mm. long, pubescent : pappus-scales subulate-lanceo- 

 late, slender-tipped, 3 in the ray, 5 in the disk. 



In sand, peninsular Florida. Spring to fall. 



3. Pectis Lessingii Fernald. Foliage nearly glabrous. Stems more or less diffusely 

 branched, slender, 1-4 dm. long : leaf-blades narrowly linear, 1-3 cm. long, less than 1 

 mm. wide, acute, entire, with few bristles below the middle : heads commonly solitary on 

 filiform peduncles 1-2.5 cm. long : involucres narrow, 4-5 mm. high ; bracts linear or 

 nearly so : achenes slender, 3 mm. long : pappus-scales ovate or ovate-lanceolate, often ab- 

 ruptly narrowed into slender awns. [P. Unifolia Less., not L. ] 



In sand, peninsular Florida. 



4. Pectis ten611a DC. Foliage nearly glabrous. Stems commonly branched at the 

 base, the branches erect or spreading, 0.5-2.5 cm. long, fastigiate or cymose near the tips : 

 leaf-blades narrowly linear, 1-5 cm. long, acute, with few bristles near the base : heads not 

 showy : involucres cylindric, 4 mm. high ; bracts linear, finally involute : ray-flowers rela- 

 tively conspicuous ; ligules mainly ovate, 2.5-3.5 mm. long: achenes slender, 3 mm. long, 

 ribbed : pappus-scales 3-6, slender, about as long as the acliene, the crown wanting. 



In sandy soil, Texas and adjacent Mexico. Spring to fall. 



5. Pectis angUBtifolia Torr. Foliage nearly glabrous, lemon-scented. Stems erect 

 or branched at the base, the branches spreading, 0.5-2 dm. long: leaf-blades narrowly 

 linear, 2-4.5 cm. long, entire, with few bristles near the base : heads nearly sessile, in 

 clusters : involucres cylindric, 3-3.5 mm. high ; bracts about 8, linear or nearly so, invo- 

 lute, obtuse : achenes 4 mm. long, slender : pappus a crown of 4-5 usually united scales, 

 sometimes accompanied by 2 slender awns. 



On plains and dry hills, Colorado to Texas and Arizona. Spring to fall. 



130. ANTHEMIS L. 



' Annual or perennial caulescent, often heavy-scented herbs. Leaves alternate : blades 

 pinnatifid or dissected, the segments slender. Heads radiate, long-peduncled. Involucres 

 hemispheric, many-flowered : bracts in several series, appressed, scarious-margined. Re- 

 ceptacle convex, conic or oblong, chaflTy, at least near the top. Ray-flowers pistillate, 

 fruit-producing, or neutral : ligules white or yellow. Disk-flowers perfect, fruit-produc- 

 ing : corollas yellow. Anthers entire and obtuse at the base. Stigmas of the disk-flowers 

 truncate. Achenes angled, ribbed or striate. Pappus wanting or a mere border. 



