66 



NORTH AMERICAN FLORA 



[Voi<UME 34 



Stamens included; some of the outer bracts spreading above. 

 Perennials or biennials; corollas all alike; squamellae 8-15, linear, lanceo- 

 late or oblong, with no smaller outer ones. (Macrocarphtjs.) 

 Plants not suffrutescent; leaves bipinnatifid or pinnatifid with lobed 

 divisions. 

 Leafy-stemmed plants. 



Plant densely white-floccose, usually somewhat villous. 



Leaves mostly basal, broadly obovate in outline, with 

 approximate divergent divisions; branches of the in- 

 florescence mostly diverging at the base and curved 

 upwards. 

 Leaves scattered, ovate or lanceolate in outline; branches 

 of the inflorescence erect or ascending, strict. 

 Plant 1-3 dm. high, not fruticulose; leaves regularly 



pinnatifid. 

 Plant 3-4 dm. high. 



Leaves narrow, almost regularly pinnatifid; .plant 



often fruticulose at base. 

 Leaves broader, interruptedly pinnate with smaller 

 segments interposed between the larger ones; 

 plant not fruticulose. 

 Plant sparingly floccose, in age glabrate and greener. 



Squamellae about half as long as the corollas ; low perennials, 



1-2 dm. high, branched at the caudex. 

 Squamellae at least two-thirds as long as the corollas. 



Bracts shorter than the disk ; stem 2-4 dm. high ; biennials 

 or perennials with a persistent caudex. 

 Outer bracts not spreading; stout biennial, usually 



simple below. 

 One or two of the outer bracts more or less spreading; 

 slender perennial with branched caudex. 

 Bracts equaling the disk; stem 1-2 dm. high, from a 

 cespitose rootstock. 

 Subscapose perennials, with rosuUate leaves and nearly naked 

 peduncles. 

 Leaves oblanceolate, elliptic or linear in outline; plants with a 

 cespitose caudex. 

 Leaves oblanceolate or elliptic in outline, sparingly floccose. 

 Inner bracts acuminate; leaf -blades narrowly lanceolate 



in outline. 

 Inner bracts barely acute; leaf -blades broadly ovate or 

 obovate in outline. 

 Involucre floccose and glandular-puberulent, not sub- 

 tended by smaller bracts. 

 Involucre densely glandular hirsute, subtended by 

 one or two shorter and looser bracts. 

 Leaves linear in outline, densely white-woolly. 

 Leaves obovate, cuneate, or flabelliform in outline, villous; plant 

 with a cespitose rootstock. 

 Involucre 12-15 mm. high and broad; bracts linear, the 



inner acute. 

 Involucre about 8 mm. high and broad; bracts linear- 

 spatulate, rounded at the apex. 

 Plants suffrutescent; leaves pinnate with linear, usually entire divisions. 

 Leaf-segments short; involucre 12-13 mm. high; squamellae 13-15. 

 Leaf-segments long; involucre 18-20 mm. high; squamellae 8-12. 



20. C. macrantha. 



21. C. brachiata. 



22. C. achilleaefolia. 



23. C. imhricala. 



24. C. cheilanthoides . 



25. C. humilis. 



26. C. Douglasii. 



27. C. rubricaulis. 



28. C. peduncularia. 



29. C. minuscula. 



30. C. alpina. 



31. C pumila. 



32. C. santoUnoides. 



33. C. nevadensis. 



34. C Evermanii. 



35. C. Parishii. 



36. C. suffrutescens. 



1. Chaenactis artemisiaefolia A. Gray, Proc. Am. Acad. 10: 74. 



1874. 



Acarphaea artemisiaefolia Harv. & Gray; A. Gray, Mem. Am. Acad. II. 4: 98. 1849. 

 Acicarphaea artemisiaefolia Walp. Ann. 2: 877. 1852. 



A branched annual; stem striate, 3-5 dm. high, scurfy-pubescent when young, glandular- 

 puberulent above; leaves 5-10 cm. long, scurfy when young, more or less glandular, especially 

 beneath, bi- or tri-piimatifid with linear or oblong, divergent and irregular divisions; heads 

 loosely cymose; peduncles" 3-10 cm. long, glandular; involucre about 10 mm. high and 15-20 

 mm. broad; bracts linear, acuminate or acute, densely glandular-puberulent and viscid- 

 hirsute; corollas ochroleucous, 6 mm. long; tube glandular-puberulent; marginal corollas only 

 slightly enlarged; achenes somewhat compressed, finely striate, somewhat clavate; pappus 

 wanting, represented by a callous margin. 



Type locality : CaUfomia. 



DiSTRrBUTiON : Southern California and Lower California. 



Illustration: Bot. Mex. Bound. Surv. pi. 32. 



