CISTACEAE 797 
4. Helianthemum Georgianum Chapm. Stems erect or spreading, 1-3 dm. long, 
usually branched at the base and above, often zigzag: leaf-blades oblong or slightly nar- 
rower below the middle, 1-2 cm. long, flat or slightly revolute, paler beneath than above, 
the lateral nerves as well as the midrib prominent beneath: flowers few, the petaliferous 
with 12-16 stamens and 35 ovules, the apetalous with 8 stamens and 17 ovules: sepals 
various, the larger ovate or oval, becoming 4 mm. long, acute or slightly acuminate: corolla 
yellow, 15-18 mm. broad : capsules ovoid-globose, about 4 mm. long, apiculate. 
In sandy soil, Georgia to Mississippi and Texas. 
5. Helianthemum Nashii Britton. Stems several or numerous, ascending or decum- 
bent, 1.5-4 dm. long, simple or sparingly branched above: leaf-blades oblong or linear- 
oblong, 1.5-3 em. long, acute or obtuse low down on the stem, the midrib and lateral 
nerves rather prominent beneath : flowers in thyrsoid panicles, the petaliferous with 15 
stamens and 8-10 ovules, the apetalous with 3 stamens and 3 ovules: sepals various, the inner 
oval or oval-oblong, becoming 3-4 mm. long, obtuse: corolla yellow, 16-20 mm. broad : 
petals broadly cuneate, slightly eroded : capsules broadly ovoid, 3-3.5 mm. long, blunt. 
In the scrub, peninsular Florida. 
6. Helianthemum thyrsoideum Barnhart. Similar to H. Nashii in habit, but the 
leaves scarcely veined beneath, the inflorescence less widely branched, and the pedicels and 
the sepals densely hirsute. 
In dry sandy soil, Hillsborough County, Florida. 
7. Helianthemum rosmarinifólium Pursh. Stems erect, 2-7 dm. tall, often branch- 
ing throughout: leaf-blades linear or narrowly linear-oblanceolate, or those on basal shoots 
broader, 1-2.5 em. long, revolute, paler beneath than above, the midrib prominent beneath : 
petaliferous flowers few, on filiform pedicels 1-1.5 cm. long, with 12-20 stamens and 8 ovules, 
their sepals ovate, 2-2.5 mm. long, their corollas 12-15 mm. broad, their capsules 2-2.5 
cm. long: apetalous flowers in dense clusters, with 3 stamens and 3 ovules, their capsules 
short-pedicelled, about 1 mm. broad. 
In sandy soil, South Carolina and Arkansas to Florida, Mississippi and Texas. 
8. Helianthemum Canadénse (L.) Michx. Stem at first simple, later with slender 
elongated branches, erect, ascending, or sometimes diffuse, 1-6 dm. high: leaf-blades 
oblong, linear-oblong or oblanceolate, nearly sessile, 1.2-3 cm. long, 4-8 mm. wide, rough 
and dark green above, paler and canescent beneath, the margins commonly revolute in 
drying: petaliferous flowers solitary, or rarely 2 together, with 30 stamens and 30-60 
ovules, their sepals pilose, their corollas bright yellow, 1.8-3 em. broad, their capsules 
ovoid or obovoid, rounded above, 6-8 mm. long, much overtopped by the later elongating 
axillary branches : apetalous flowers appearing later, axillary, nearly sessile, with 4 stamens 
and 6-20 ovules, their capsules about 4 mm. in diameter: seeds papillose. 
In dry rocky or sandy soil, Maine to Indiana, Wisconsin, North Carolina and Kentucky. 
9. Helianthemum majus (L.) B.S.P. Stem erect, 3-6 dm. fhigh, at first simple, 
later with numerous short ascending branches: leaf-blades oblong-lanceolate or oblanceolate, 
acute or obtuse, 1.5-3.5 em. long, stellate-canescent beneath, darker above, short-petioled : 
petaliferous flowers 5-12 in a terminal cymose raceme with 30 stamens and 30-60 ovules, 
their sepals densely canescent, the outer nearly as long as the inner, their corollas 1.5- 
2.5 em. broad, light yellow, their capsules ovoid, 3-4 mm. long, little if at all overtopped 
by the later axillary branches: apetalous flowers appearing later, with 4 stamens and 6-20 
ovules, minute, clustered in the axils, nearly sessile, their capsules about 2 mm. in diam- 
eter : seeds evenly reticulated. 
In dry soil, Maine to Minnesota, South Dakota, Georgia and Texas. 
2. HUDSONIA L. 
Shrubs, with low tufted diffusely branched stems. Leaves small, subulate or scale- 
like, imbricated. Flowers numerous, yellow, terminating branches. Petals 5, obovate- 
oblong. Stamens 8. Style filiform. Stigma minute. Capsule 3-valved, included in the 
calyx. Seeds few. Embryo slender, spirally curved. Bracs HEATHER. 
DORUM a at least, with a iinesr-eubulate lobe. 1. H. montana. 
F Ovary pubescent at the top: one sepal, at least, with a tooth near the apex. 2. H. ericoides. 
lowers sessile or nearly so: p eaa scale-like: ovary glabrous. 3. H. tomentosa. 
1. Hudsonia montana Nutt. Bushy, somewhat villous throughout, the branches tufted 
1-1.5 dm. long. Leaves commonly erect, sometimes spreading in age, filiform-subulate, 
3-6 mm. long, approximate: pedicels 8-10 mm. long, slender, woolly-villous: flowers 
