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|Jepson eFlora: Taxon page
Key to families | Table of families and genera
Index to accepted names and synonyms:
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|Family: Apiaceae (Umbelliferae)||View Description||Dichotomous Key|
|Genus: Heracleum||View Description||Dichotomous Key|
|Species:||View Description||Dichotomous Key|
Heracleum maximum W. Bartram
Habit: Plant 1--3 m, stout, tomentose, strong-scented. Leaf: round to reniform; petioles 1--4 dm, widely sheathing, distal sheaths enlarged, bladeless; blades 2--5 dm wide, ternate, leaflets 1--4 dm wide, ovate to round, cordate, lobed, coarsely serrate. Inflorescence: tomentose or long-hairy; peduncle 5--20 cm; rays 15--30, 5--10 cm, unequal; pedicels 8--20 mm. Flower: petals obovate, white. Fruit: 8--12 mm, obovate to obcordate, +- hairy. Chromosomes: 2n=22.
Ecology: Moist places, wooded or open; Elevation: < 2900 m. Bioregional Distribution: CA-FP, GB; Distribution Outside California: to Alaska, eastern United States, Arizona. Flowering Time: Apr--Jul Note: Only native Apiaceae sp. found from eastern to western North America.
Synonyms: Heracleum lanatum Michx.
Unabridged Note: Relationship to some Eurasian taxa unclear.
eFlora Treatment Author: Lincoln Constance & Margriet Wetherwax
Jepson Online Interchange
Previous taxon: Heracleum
Next taxon: Ligusticum
Citation for this treatment: Lincoln Constance & Margriet Wetherwax 2017. Heracleum maximum, in Jepson Flora Project (eds.) Jepson eFlora, http://ucjeps.berkeley.edu/eflora/eflora_display.php?tid=27996, accessed on March 28, 2017.
Citation for the whole project: Jepson Flora Project (eds.) 2017. Jepson eFlora, http://ucjeps.berkeley.edu/eflora/, accessed on March 28, 2017.