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Oligoneuron houghtonii
Oligoneuron houghtonii (Torr. & A. Gray ex A. Gray) G.L. Nesom
Houghton's Goldenrod
Asteraceae (Aster Family)
Synonym(s): Solidago houghtonii
USDA Symbol: OLHO
USDA Native Status: L48 (N), CAN (N)
Federally-listed threatened species. Plants in New York (a single population) previously thought to be a separate species has been confirmed genetically to be this species.
Plant Characteristics
Duration: PerennialHabit: Herb
Leaf Arrangement: Alternate
Leaf Complexity: Simple
Leaf Shape: Lanceolate , Ovate
Leaf Pubescence: Glabrous
Leaf Margin: Ciliate , Entire
Leaf Apex: Acute , Obtuse
Inflorescence: Head
Size Notes: Up to about 2 feet tall.
Leaf: Leaves: basal tapering to long, winged petioles, blades ovate, to 7-22 mm wide, margins entire, apices acute, faces glabrous; proximal cauline tapering to winged petiole-like bases partially clasping stems, blades sometimes 3-nerved (2 prominent lateral nerves arising proximally and running alongside midnerve for some distance before diverging), linear oblanceolate , 158-177 x 7-22 mm, margins entire, ciliate, apices acute to obtuse, glabrous; mid to distal sessile, blades linear lanceolate , mid often 3-nerved (obscurely sometimes), distal 1-nerved, 47-100 x 4-10 mm, reduced distally. (Webref 3).
Flower: Ray florets 6-12 (pale to bright yellow); laminae 7.4-7.9 x 0.5-0.6 mm. Disc florets 8-15; corollas 4-4.3 mm, lobes 0.9-1.5 mm. (Webref 3).
Fruit: Obconic, 1.4-1.8 mm, glabrous, ribs sometimes dark. (Webref 3). Fruit is a cypsela (pl. cypselae). Though technically incorrect, the fruit is often referred to as an achene.
Bloom Information
Bloom Color: YellowBloom Time: Aug , Sep
Distribution
USA: MI , NYCanada: ON
Native Distribution: A Great Lakes shoreline endemic found along the northern shores of Lakes Michigan and Huron ( Michigan, and Ontario, Canada). (Webref 12).
Native Habitat: Found within damp interdunal hollows and flats, swales, limestone crevices and pavements (alvars). (Webref 12).
Growing Conditions
Water Use: HighLight Requirement: Sun
Soil Moisture: Moist
Soil pH: Alkaline (pH>7.2)
CaCO3 Tolerance: High
Drought Tolerance: High
Cold Tolerant: yes
Soil Description: Moist, sandy, interdunal depressions and seasonably-wet limestone alvars. (Webref 12).
Benefit
Conspicuous Flowers: yesNational Wetland Indicator Status
Region: | AGCP | AK | AW | CB | EMP | GP | HI | MW | NCNE | WMVE |
Status: | OBL |
Web Reference
Webref 3 - Flora of North America (2014) Missouri Botanical Garden, St. Louis, MO & Harvard University Herbaria, Cambridge, MA.Webref 12 - Great Lakes Ecological Assessment: Threatened, Endangered, or Sensitive Species (2012) USDA Natural Resources Conservation Service
Additional resources
USDA: Find Oligoneuron houghtonii in USDA PlantsFNA: Find Oligoneuron houghtonii in the Flora of North America (if available)
Google: Search Google for Oligoneuron houghtonii
Metadata
Record Modified: 2012-11-07Research By: Joseph A. Marcus