402 CORRIGIOLACEAE 
broadly lanceolate, about 3 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. [Siphonychia 
erecta Chapm. ] 
In sand along the coast, Florida to Alabama. 
2. Odontonychia corymbósa 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. [Stphonychia 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 tothe apex: hypanthium broadly rounded at the base. 1. S. diffusa. 
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. pauciflora. 
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 em. long, acute, very hairy, sessile : hypanthium pubes- 
cent with hooked hairs at the base: flowers oblong-urceolate, 1.5 mm. 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 sma 
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 pauciflóra Small. Annual or biennial, minutely pubescent. Stems 
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 : flowersurn-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. Hypanthium shorter than the sepals, 
ribbed. Calyx of 5 narrow erect sepals. Stamen on the margin of the hypanthium. Style 
long and slender. 
1. Gibbesia Rugélii (Chapm.) Small. Foliage finely pubescent. Stem erect, rather 
slender, 1-5 dm. tall, forking, tinally diffuse : leaves few ; blades thickish, oblanceolate, or 
the upper linear-oblanceolate, 1-3 em. long, acute, pubescent on both sides, ciliate, sessile : 
bracts linear-subulate, their stipules ovate, acutish or short-acuminate, denticulate : calyx 
