FERNALD. — GENUS PECTIS. 77 



= = Ray-pappus aristiform, disk-pappus squamellose. 

 P. ilusbyi, Greene. " Miut-sceuted," low, hardly 1 dm. higli, simple 

 or divergently but sparingly branched, the angulate stems and peduncles 

 glabrous : leaves flat or a little revolute, spatulate-linear, with blunt or 

 rounded tips (or a few mucronulate), 2 to 3 J cm. long, 1 to 3 mm. wide, 

 with 2 or 3 pairs of sette : peduncles 3 to 6 cm. long, 2-5-bracteate : in- 

 volucre 4 to 6 mm. high, 30-40-flowered ; the flattish bracts slightly 

 keeled below, each bearing a large apical gland : rays 6 mm. long : ray- 

 pappus 2 or 3 very slender awns 2J or 3 mm. long, scarcely dilated 

 below ; disk-pappus a crown of many setaceous-tipped squamellcE, free 

 or united at the base : akenes 4 mm. long, sparingly setose or glabrate. 

 — Greene in Gray, Syn. Fl. i. pt. 2, 361. — Arizona, Beaver Creek 

 (Rusby, no. 317). 



++ ++ Bracts narrow-linear, involute, acutisli. (Forms of P. papposa may be looked 

 y for here.) 



= Pappus aristiform. 



P. Rosei. Very diffusely branching from the base ; the purplish 

 terete stems smooth : leaves strongly revolute, becoming subterete, mu- 

 cronate, equalling or exceeding the internodes, 2 to 4 cm. long, i^ to 1 mm. 

 wide, with 2 paii's of basal setJE : peduncles many, terete, 2 to 4 cm. 

 long, 4-6-bracteate : involucre 3 or 4 mm. high, about 20-flowered, the 

 acutish bracts strongly keeled and bearing conspicuous elongated black 

 glands : rays narrow, 3 mm. long, becoming rosy-tinged : pappus 2 or 3 

 slender awns 2 mm. long, and often a minute squamellose cup : akenes 

 barely 3 mm. long, spreading-hirsute. — P. punctata, Rose, Contrib. 

 U. S. Nat. Herb. i. 105, not Jacq. — Sonora, common on stony ridges, 

 Alamos (Palmer, September, 1890, no. 730). 



§ 3. Pectothrix, Gray. Pappus of many (10 or more) capillary 

 bristles, at least in the disk-flowers (or in P. papposa rarely reduced to a 

 mere crown), a few of them sometimes enlarged but hardly paleaceous. — 

 PI. Fendl. 62, PI. Wright, i. 83 & Proc. Am. Acad. xix. 47. Cri/pto- 

 petalon, Cass. Bull. Soc. Philom. Janvier, 1817, & Diet. Sci. Nat. xii. 

 123. Lorentea, Less. Linmea, v. 135, in part; DC. Prodr. v. 101, in 

 part ; Gray, PI. Wright, i. 83, in part [as section]. 



* Erect or suberect plants with ascending or spreading branches and ascending 

 rigid leaves. 



-h~ Annual, brandling mostly above the middle. 



P. elongata, HBK. Stems rather stiff, purplish, simple below, with 



ascending or spreading branches ; stems subterete, smooth, the branches 



slightly tetragonous : leaves linear, submucrouate, smooth or scabridu- 



