Part 1, 1914] CARDUACEAE : HELENIEAE 33 



2. Loxothysanus pedunculatus Rydberg, sp. nov. 



A low shrub, erect; stem terete, puberulent; leaves opposite; petioles 1-1.5 cm. long; 

 blades ovate or ovate-deltoid, sometimes .3-lobed, sinuately round-toothed, 2-3 cm. long, 

 puberulent above, grayish-tomentulose beneath; inflorescence of 1-3 heads on peduncles 3-5 

 cm. long; involucre hemispheric, 5 mm. high, 8-10 mm. broad; bracts 10-12, oblanceolate, 

 canescent; corollas 3 mm. long, white; tube glandular-pul^escent, 1.5 mm. long; lobes oblong, 

 as long as the turbinate throat; achenes 3-3.5 mm. long, hirsute; inner squamellae fully I 

 mm. long. 



Type collected in Tamasopa Canyon, San Luis Potosi, 1890, Pringle 3096 (herb. Columbia Univ.). 

 Distribution: San Luis Potosi. 



3. Loxothysanus filipes B. L. Robinson, Proc. Am. Acad. 43: 44. 



1907. 



A small shrub, procumbent; stem curved-ascending, short-pubescent; leaves alternate; 

 petioles slender, 1-1.5 cm. long, puberulent, flexuose; blades suborbicular, 1-2 cm. long, 

 crenate, green and obscurely tomentulose above, canescent-tomentulose beneath; involucre 

 turbinate-campanulate; bracts about 7, oblong, obtuse, about 3 mm. long; flowers about 30; 

 corollas 2.8 mm. long; tube 1 mm. long, glandular-puberulent, nearly equaling the throat; 

 achenes 2.8 mm. long; inner squamellae less than 0.5 mm long, the outer ones much shorter. 



Type locality: Zacuapan, Vera Cruz. 

 Distribution: Vera Cruz. 



26. PICRADENIOPSIS Rydb. ; Britton, Man. 1008. 1901. 



Low perennial canescent herbs more or less woody at the base. Leaves opposite, pal- 

 mately or pedately 3-5-divided (or the upper entire), with linear or oblong divisions, grayish- 

 strigose and prominently glandular-punctate. Heads in leafy corymbs. Involucre campanu- 

 late; bracts subequal in about two series, 3-nerved, the outer ones more or less keeled, canes- 

 cent, not at all petaloid. Ray-flowers few, pistillate, fertile; ligules short. Disk-flowers 

 many; corolla-tube glandular, about equaling the campanulate throat; lobes ovate, shorter 

 than the throat. Achenes elongate-obpyramidal, not conspicuously hirsute or hispid on the 

 angles, either glandular or hispidulous all over. Pappus of a crown of squamellae 8 in number, 

 ovate or lanceolate with a distinct costa or midrib. 



Type species, Bahia oppositifoUa "Nutt." [DC.]. 



Squamellae ovate or obovate; achenes glandular. 1. P. oppositifoUa. 



Squamellae lanceolate; achenes hispidulous. 2. P. Woodhousei. 



1. Picradeniopsis oppositifoUa (Nutt.) Rydb.; Britton, Man. 1008. 



1901. 



Tricho phyllum oppositifolium Nutt. Gen. 2: 167. 1818. 

 Helenium oppositifolium Spreng. Syst. 3: 573. 1826. 

 Bahia oppositifoUa DC. Prodr. 5: 656. 1836. 

 Eriophyllmn oppositifoUiim Heynh. Nom. Bot. 310. 1840. 



A low suffruticose perennial; stem 1-3 dm. high, much-branched, angled, canescent- 

 puberulent; leaves opposite, 3-5-divided into linear or oblong divisions or entire, 1-3 cm. long, 

 canescent-strigose and conspicuously punctate, thick; peduncles short; involucre campanu- 

 late, 5 mm. high, 7-8 mm. wide; bracts oblong, about 10, the outer ones carinate, 3-ribbed; 

 ligules 5-6, oval, 3-4 mm. long; disk-flowers numerous; corollas 3 mm. long; achenes 

 narrowly obpyramidal, 4-angled, glandular-puberulent; squamellae 1 mm. long, ovate or 

 obovate, with a distinct midrib. 



Type locality: Hills near Fort Mandan [North Dakota]. 

 Distribution: North Dakota to Montana, Arizona, and Texas. 



Illustrations: Sitgreaves, Rep Exp. Bot. pi. 3; Britt. & Brown, 111. Fl. pi. 3967; ed. 2. pi. 

 4536; E. & P. Nat. Pfl. 4*: /. 124. O. 



