1274 



CARDUACEAE 



104. CALYPTRO CARPUS Less. 

 Herbs, similar to species of SynedreLla in habit. Involucres of few herbaceous bracts. 

 Achenes of the ray and disk alike, or some of those of the ray 3-angled, all wingless. 

 Pappus of 2 or 3 awns with a rim at the base. 



1. Calyptrocarpus Tampickna (DC.) Small. Stems branched at the base, the 

 branches prostrate or creeping, 1-3 dm. long. Leaf-blades ovate, 1-3 cm. long, acute, shal- 

 lowly serrate, broadly cuneate to subcordate at the base, petioled : peduncles 1-5 mm. long : 

 heads inconspicuous : involucres 5-8 mm. high ; bracts broadly oblong : achenes about 5 mm. 

 long, those of the ray with several marginal bristles. {^Calyptrocarpus I'ialis Less.] 



In dry soil and waste places, southern Texas. Also in tropical America. 



105. COREOPSIS L.i 



Annual or perennial herbs. Leaves various. Heads terminating the peduncle-like 



branches, consisting of both tubular and radiate flowers, the ray-flowers neutral, yellow, 



particolored, or in two species pink. Disk flowers perfect, fruit-producing. Involucres 



campanulate or hemispheric, their bracts in two series, all more or less united at the base, 



those of the outer series usually narrow and herbaceous, the inner series broad, variously 



colored, either thin and scarious or with scarious margins. Receptacle flat or slightly 



convex, chaffy, the chaff flat or slightly concave. Achenes flat or more or less convex on 



the back, from oblong to orbicular, winged or wingless. Pappus of two fimbriolate scales, 



delicate awns, minute teeth, a mere coroniform border, or none. Tickseed. 



Stigmas with acute or cuspidate tips. 



Leaf-blades, or their divisions, with entire margins. 



Stigma-tips cuspidate : chaff of the receptacle with broad bases and attenuate filiform tips : leaf- 

 blades simple or piiinately lobed. Eucoreopsis. 

 Ligules uniformly yellow : perennial plants. 

 Achenes with broad outspread wings. 



Stems leafy near the base, bearing long, naked, peduncle-like branches. 

 Plants glabrous except the ciliate bases of the leaves. 

 Plants pubescent except near the inflorescence. 

 Stems leafy to near the summit : peduncle short. 



Leaf-blades broad, simple or with 1-5 small, lateral lobes. 

 Leaf-blades pinnately parted into narrow divisions. 

 Leaf-segments linear-lanceolate. 

 Leaf-segments linear or filiform. 

 Achenes with strongly incurved entire wings, which become callus- 

 thickened at maturity. 

 Ligules discolored : annual plants. 

 Stigma-tips acutely conical : chaff of the receptacle linear or with slightly 

 dilated tips : leaf-blades palmately lobed or divided. Anacis. 

 Leaves with petioled blades. 

 Leaves with sessile blades. 



Leaf-blades 3-cleft to about the middle, the basal portion 3-veined. 

 Leaf-blades divided to the base. 

 Disk-flowers with yellow corollas. 



Divisions of the leaf-blades broader than linear. 

 Divisions of the leaf-blades linear or filiform. 

 Disk-flowers with purple-brown corollas. 



Divisions of the leaf-blades comparatively few, 2-4 mm. broad : 



internodes mostly longer than the leaves. 

 Divisions of the leaf-blades very numerous, appearing in dense 

 fascicles, 1-2 mm. broad : internodes mostly shorter than 

 the leaves. 

 Leaf-blades regularly toothed. Silphidium. 

 Stigmas with truncate or obtusely conical tips. Calliopsis. 

 Achenes wingless. 



Ligules of the ray-flowers yellow with crimson-brown base : flowers of the 

 disk with dark red corollas. 

 Outer involucral bracts much shorter than the inner : achenes narrowly 



oblong, thin, flat. 

 Outer involucral bracts mostly about as long as the inner : achenes obo- 

 vate, thick, convex. 

 Ligules of the ray-flowers pink : flowers of the disk with yellow corollas. 

 Achenes winged. 



A. Achenes with entire scarious wings. 

 Pappus of minute teeth or wanting. 

 Ligules discolored. 

 Ligules uniformly yellow. 

 Pappus of conspicuous awns (sometimes deciduous at maturity). 



a. Leaf-blades, or some of them, lobed : internodes mostly shorter 

 than the leaves. 

 Ligules discolored (Texan species). 



15. C. thictona. 



16. 

 17. 



18. 

 19. 



Drummondii. 

 rosea. 



C. cardaminefolia. 

 C. stenophylla. 



20. C. dmiiis. 



' Contributed by Mr. F. E. Boynton. 



