956 CARDUACEAE 



8. G. arizonica A. Gray. Annual; stem 1-3 dm. high, branched and leafy 

 at the base, puberulent; leaves pinnatifid or lobed, with obtuse divisions, puberu- 

 lent or pilose; peduncles 1-2 dm. long; involucres about 15 mm. broad; bracts 

 lanceolate or linear, acute; disk yellow; ligules yellow, 10-15 mm. long. Dry 

 regions: s Utah Ariz. Nev. L. Son. Mr-My. 



9. G. spathulata A. Gray. Stem leafy, 1-3 dm. high, finely puberulent 

 or glabrate; leaves spatulate, petioled, thick; peduncles short; involucres 15-20 

 mm. broad; bracts ovate-lanceolate, acuminate; disk yellow; squamellae lanceo- 

 late, long-aristate, surpassing the disk. Dry valleys: Utah. Son. Je-Jl. 



10. G. Parryi Greene. Leaves petioled, ovate or obovate, all basal, thick, 

 glabrous or minutely puberulent; peduncles 1-3 dm. high; involucres about 2 

 cm. wide; bracts ovate, abruptly acuminate; disk yellow; ligules yellow, 15-20 

 mm. long; squamellae narrowly lanceolate, short-aristate. G. acaulis A. Gray, 

 not Pursh. Arid regions: s Utah Ariz. L. Son. Je-Jl. 



112. BOEBERA Willd. FETID MARIGOLD. 



Annual or perennial herbs. Leaves opposite or the upper alternate, pin- 

 nately or bipinnately dissected. Heads usually radiate. Involucre hemi- 

 spheric, turbinate or broadly campanulate, with a distinct calyculum; principal 

 bracts 8-10, broad, thin and somewhat scarious on the margins, with 3-7 con- 

 spicuous glands; receptacle puberulent. Ray-flowers pistillate and fertile; lig- 

 ules oblong to rounded-oval, yellow or orange. Disk-flowers many. Style- 

 branches with a short conic or obtuse appendage. Achenes hirsute, more or less 

 angled, somewhat compressed, cuneate-oblong. Pappus of 8-15 squamellae, 

 each dissected into 5-10 bristles. [Dyssodia Cav., not Lour.] 



1. B. papposa (Vent.) Rydb. Ill-scented annual; stem leafy, branched, 

 1-3 dm. high; leaves pinnately or bipinnately divided into linear lobes; invo- 

 lucres 6-8 mm. high and as broad; outer bracts linear, green, the inner 8-10, 

 oblong, scarious, tipped, brownish green or purplish-tinged, with conspicuous 

 oblong glands; ligules few, inconspicuous. Dyssodia chrysanthemoides Lag. D. 

 papposa (Vent.) Hitchc. Prairies, river valleys, roadsides, and waste places: 

 Ohio La. Ariz. Mont.; Mex. Son. Submont. Jl-S. 



113. THYMOPHYLLA Lag. TINY TIM. 



Annual or perennial herbs. Leaves opposite or alternate, or both, pin- 

 nately dissected into narrow lobes. Heads usually radiate, peduncled. Invo- 

 lucre turbinate, campanulate, or hemispheric, with or without a few small ac- 

 cessory bracts below; principal bracts in one or two more or less distinct series, 

 equal in length and more or less united, each with 1-5 glands towards the tip. 

 Receptacle naked. Ray-flowers pistillate and fertile, rarely wanting. Disk- 

 flowers hermaphrodite, fertile. Style-tips obtuse or truncate. Achenes clavate, 

 4-5-angled. Pappus of normally 10 (rarely 11-20) squamellae most often in 

 two series. [Hymenatherum Cass. Lowellia A. Gray.] 



Annuals; pappus-squamellae muticous. 1. T. aurea. 



Perennials; pappus-squamellae awn-tipped. 2. T. Thurberi. 



1. T. aurea (A. Gray) Greene. Glabrous annual; stem branched from 

 below, leafy, 1-1.5 dm. high; leaves alternate, pinnately parted into 7-9 linear- 

 filiform divisions; involucres 4-5 mm. high, 5-6 mm. broad; bracts oblanceolate, 

 with conspicuous glands; ligules about 12, oblong, 5-6 mm. long; pappus of 6-8 

 quadrate or oblong, erose-truncate scales. Lowellia aurea A. Gray. Hymen- 

 atherum aureum A. Gray. Dyssodia aurea A. Nels. Dry plains: Colo. Tex. 

 N.M. Je-O. 



2. T. Thurberi (A. Gray) Woot. & Stand]. Suffruticose perennial; stems 

 much branched, 1-2 dm. high, puberulent or glabrate; leaves pinnatifid, with 

 filiform divisions, more or less finely short-pilose; involucres 4-6 mm. high and 

 broad; outer bracts 1-3, subulate, very small; inner bracts linear, with triangular 

 tips and 3-5 glands; ligules oblong, about 3 mm. long; outer pappus-squamellae 



