402 COBRIGIOLACEAE 





broadly lanceolate, about as long as the leaves : cymes corymbosely disposed : calyx 3 

 mm. long, glabrous : sepals lanceolate or oblong-lanceolate, obtuse or acutish, slightly 

 longer than the angled glabrous hypanthium : utricle about 1 mm. in diameter. [Siphonyckia 

 erecta Chapm.] 



In sand along the coast, Florida to Alabama. 



2. Odontonycbia corymbosa Small. Perennial, stoutish, pubescent with recurved 

 hairs. Stem branched at the base, the branches tufted, 1-3 dm. tall, erect or ascending, olive- 

 green or brownish, forking, especially above, ribbed, topped by the corymbosely disposed 

 cymes : leaf-blades oblanceolate to oblong-oblanceolate, 0.5-1.5 cm. long, acutish, ciliate, 

 sessile; stipules ovate, silvery, long-acuminate: inflorescence silvery: calyx 2-2.2 mm. 

 long : sepals oblong or ovate-oblong, white, longer than the pubescent hypanthium, obtuse, 

 concave: utricle ovoid, 1 mm. long. [Siphonychia corymbosa Small.] 



In sand, Ship Island, Mississippi. 



5. SIPHONYCHIA T. & G. 



Annual or biennial herbs, with diffuse stems. Leaves opposite : blades fleshy, often 

 deciduous. Flowers in rather dense dichotomous cymes. Calyx urn-shaped, sessile. 

 Sepals 5, equalling the hypanthium, white-tipped, inflexed, obtuse or mucronate. Stamens 

 5, included : filaments inserted on the margin of the hypanthium. Styles mainly united. 

 Utricle included. Seed resupinate. The plants flower from spring to fall. 



Sepals narrowed to the apex : hypanthium broadly rounded at the base. 1. S. diffiLsa. 

 Sepals dilated at the apex : hypanthium narrowed at the base. 



Hypanthium sparingly and inconspicuously pubescent: cymes many-flowered. 2. S. Americana. 



Hypanthium bristly pubescent : cymes few-flowered. 3. S. paucijtora. 



1. Siphonychia diffusa Chapm. Annual, slender, minutely pubescent. Stems 

 branched at the base, the branches wiry, spreading radially, prostrate, 1-6 dm. long, fork- 

 ing, the ultimate divisions ending in dense often rectangular cymes : leaf-blades oblanceo- 

 late or linear-oblanceolate, 0.5-1. 5 cm. long, acute, very hairy, sessile : hypanthium pubes- 

 cent with hooked hairs at the base: flowers oblong-urceolate, 1.5 ram. long : sepals ovate, 

 slightly shorter than the hypanthium, white-margined, minutely cuspidate below the hooded 

 apex : style included : utricle ovoid, less than 1 mm. long. 



In dry sandy soil, Florida to Alabama. 



2. Siphonychia Americana (Nutt. ) T. & G. Annual or biennial, slender, minutely 

 pubescent. Stems branched at the base, the branches spreading radially, prostrate, 2-7 

 dm. long, wiry, diffusely forking, pubescent in lines, the ultimate divisions ending in .small 

 dense cymes : leaf-blades linear-oblanceolate, or the upper spatulate, the basal much longer 

 than the stem-leaves, 2-5 cm. long, acute or acutish ; stem-leaves 0.5-2 cm. long, sessile : 

 hypanthium inconspicuously pubescent with hooked hairs : flowers urn-shaped, 1.5-2 mm. 

 long : sepals shorter than the hypanthium, the tips white, rounded, inflexed, minutely 

 cuspidate on the back : style exserted : utricle ovoid, about 0.8 mm. broad. 



In sandy soil, South Carolina to Florida. 



3. Siphonychia pauciflora Small. Annual or biennial, minutely pubescent. Steins 

 branched at the base, the branches spreading, prostrate, 1-6 dm. long, sparingly forked, 

 the ultimate divisions ending in inconspicuous few-flowered cymes or the flowers sometimes 

 solitary: leaf-blades spatulate to oblong-spatulate or linear-spatulate, 0.8-2 cm. long, or 

 shorter above, ciliolate : flowers urn-shaped, about 2 mm. long : hypanthium bristly pubes- 

 cent, narrowed at the base : sepals white or broadly white-margined, dilated at the apex, 

 very minutely cuspidate on the back : style included : utricle 0.8 mm. long. 



In sand or sandy soil, Georgia and Florida. 



6. GIBBESIA Small. 



Annual or biennial pubescent herbs. Stems erect, forking above, the ultimate divi- 

 sions disposed in cymes. Leaves opposite : blades narrow. Cymes many-flowered, rather 

 dense. Flowers inconspicuous, usually 3 together in an involucre and each one or only 2 

 of them seated in a hard clamp-like involucel. Hypanthinm shorter than the sepals, 

 ribbed. Calyx of 5 narrow erect sepals. Stamen on the margin of the hypanthium. Style 

 long and slender. 



1. Gibbesia Rugelii ( Chapm. ^ Small. Foliage finely pubescent. Stem erect, rather 

 slender, 1-5 dm. tall, forking, finally diffuse : leave? few ; blades thickish, oblanceolate, or 

 the upper linear-oblanceolate, 1-3 cm. long, acute, pubescent on both sides, ciliate, sessile : 

 bracts linear-subulate, their stipules ovate, acutish or short-acuminate, denticulate : calyx 



