400 CORRIGIOLACEAE 



acute, deciduous: calyx shorter tlian the bracts: sepals cuneate, 2 mm. long (with the 

 cusps), hooded above, the awn-like cusp nearly as long as the body of the sepal, ascending 

 or diverging. 



In dry soil, Texas. 



4. Paronychia Lindheimeri Engelm. Annual or biennial, slender, glabrous. Stem 

 branched at the base, the branches erect or ascending, wiry, 0.5-2 dm. tall, forking above or 

 throughout : leaf -blades nearly filiform, 0.5-1.5 cm. long, acute, sessile ; stipules narrowly 

 lanceolate: cymes open: sepals oblong, 1.7-2 mm. long, slightly Jiooded, scabrous at the 

 base, minutely cuspidate, the cusp more or less spreading. 



In dry soil, Texas and New Mexico. 



5. Paronychia scoparia Small. Perennial, rather slender, minutely pubescent. 

 Stem much branched at the base, the branches tufted, erect or ascending, 2-3 dm. tall, 

 simple below, sparingly forked above, roughish : leaf-blades linear-filiform, 1-3 cm. long, 

 acute, grooved on either side of the midrib, serrulate-ciliate, especially near the apex, ses- 

 sile ; stipules linear-lanceolate, 1-1.5 cm. long, attenuate : branches of the cymes erect or 

 strongly ascending : sepals linear-lanceolate, gradually narrowed to the apex, 3-3.5 mm. 

 long, firm, keeled, usually with a short lateral nerve on each side of the keel, hooded, each 

 prolonged into a stout ascending cusp, which is ^ to J as long as the body : stamens half as 

 long as the sepals. 



In dry soil, Indian Territory and Texas. 



6. Paronychia dichotoma ( L. ) Nutt. Perennial, slender, the foliage glabrate or 

 nearly so. Stem branched at tlie base, the branches erect or ascending, tufted, 1-4 dm. tall, 

 rigid, wire-like, forking above : leaf-blades linear-filiform, 1-4 cm. long, acute, smooth ; 

 stipules linear-lanceolate, 8-13 mm. long, long-attenuate, silvery : cymes open, many- 

 flowered : sepals lanceolate, about 3 mm. long, slightly hooded, the back produced into a 

 short terminal cusp : stamens fully ^ as long as the sepals. 



In rocky soil, Maryland to North Carolina, Arkansas and Texas. Nailwort. 



7. Paronychia Jam^sii T. & G. Perennial, minutely pubescent. Stem usually 

 much branched at the base, the branches tufted, erect or ascending, 0.5-2 dm. tall, forking 

 above : leaf-blades linear-filiform, 0.5-2 cm. long, acute, sessile ; stipules silvery, linear- 

 lanceolate : cymes slightly open : calyx about 2.5 mm. long : sepals lanceolate, gradually 

 acuminate, hooded, each terminating in a short more or less spreading cusp : utricle ovoid, 

 less than 1 mm. in diameter. 



In dry soil, Nebraska and Colorado to Texas, Arizona and Mexico. 



8. Paronychia Wdrdi Eydb. Perennial, puberulent or minutely pubescent. Stem 

 much branclied at the base, the branches quite slender : leaf-blades narrowly linear to 

 linear-filiform, 0.7-2 cm. long, acute, early deciduous or fugacious: cymes widely open, 

 the branches diverging : calyx about 2 mm. long : sepals oblong, abruptly acuminate : 

 utricle somewhat smaller than that of the next preceding species. 



In dry or stony soil, Kansas and Colorado to Texas and New Mexico. 



9. Paronychia argjrrocoma (Michx. ) Nutt. Perennial, finely pubescent, conspicuous 

 on account of the numerous silvery stipules. Stem branched at the base, the branches ascend- 

 ing or decumbent, tufted, 0.5-3 dm. long, simple or sparingly forked, the hairs recurved : 

 leaf-blades linear or nearly so, 1-3 cm. long, acute, ciliolate, rather fleshy ; stipules lanceo- 

 late, 5-10 mm. long, acuminate : flowers in congested cymes : sepals narrowly lanceolate, 

 4-5 mm. long, firm, long-attenuate, ciliate, the tips and edges hyaline : stamens about 5 as 

 long as the sepals : anthers dark green : utricle nearly oblong, about 1.5 mm. long. 



On cliffs, Maine and New Hampshire to Georgia and Tennessee. 



2. ANYCHIASTRUM Small. 

 Annual or perennial mostly ^4/?^c/iici-like herbs, witli finely pubescent or glabrous foli- 

 age. Stems branched at the base, the branches diffusely spreading or prostrate. Leaves op- 

 posite : blades narrow or as broad as long. Flowers in dichotomous cymes, inconspicuous. 

 Bracts similar to the leaves. Caly.x manifestly pedicelled. Sepals distinct or nearly so, 

 merely cuspidate, erect. Stamens mostly 5, inserted at the base of ovary. Styles relatively 

 long, united to near the top. Utricle included. The plants flower during the summer 

 and fall. 



Annual or biennial : calyx pubescent. 



Calyx becorainpr 2 mm. long : sepals bristly pubescent. 1. A. herniarioides. 



Calyx becoming 1 mm. long: sepals inconspicuously pubescent. 2. A. Baldwinii. 



Perennial : calvx glabrous. 3. A. riparium. 



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