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↑Recently Updated Plant Articles

Coastal Plain Joe Pye Weed (Eutrochium dubium)

Updated September 12th, 2024

A perennial of moist, sandy, acidic soils native to the coastal plain from New England south through South Carolina.

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Hollow Joe Pye Weed (Eutrochium fistulosum)

Updated September 11th, 2024

A tall perennial of moist, rich, disturbed sites, native to the eastern U.S.; the tallest Eutrochium.

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Persian Silktree (Albizia julibrissin)

Updated August 28th, 2024

A small nitrogen-fixing tree native to the warmer parts of Asia. and planted as an ornamental in the US, where it has become invasive.

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↑Recently Updated Ecoregion Articles

North America » Northwestern Forested Mountains »

Boreal Cordillera

Updated November 7th, 2024

An assemblage of mountains in interior northwestern Canada and Alaska, spanning the transition between forests and open tundra.

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North America » Tundra » Alaska Tundra »

Seward Peninsula

Updated November 6th, 2024

The peninsula of western Alaska closest to Asia, with varied topography and sparse, but diverse vegetation cover.

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North America » Tundra » Alaska Tundra »

Subarctic Coastal Plains

Updated November 4th, 2024

A poorly-drained region of open tundra with numerous small ponds, on the coast of western Alaska along the Bering Sea.

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↑Recently Updated ID / Comparison Guides (See All)

Northern Red Oak (Quercus rubra) vs. Black Oak (Quercus velutina)

Updated October 13th, 2024

Although these species sometimes look blatantly different, significant variation in individual leaf shape and other characteristics can make them challenging to tell apart. Both trees have broad habitat preferences, with considerable overlap. Black oak ranges farther south and prefers slightly warmer, drier sites, and is more tolerant of nutrient-poor sites, whereas northern red oak ranges farther north, prefers slightly cooler, moister sites, and is more shade-tolerant. The two species can also hybridize and form intergrades, so it may not be possible to identify all individuals.

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White Snakeroot (Ageratina altissima) vs. Late Boneset (Eupatorium serotinum)

Updated October 13th, 2024

These closely-related plants can be tricky to distinguish, especially early in the season, before they bloom. Although they have some overlap in habitat, late boneset ranges farther south and prefers sunnier, wetter habitats, and is more tolerant of acidic soil, whereas white snakeroot ranges farther north and prefers shadier, drier conditions but requires more neutral soils.

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Partridge Pea (Chamaecrista fasciculata) vs. Persian Silktree (Albizia julibrissin)

Updated September 16th, 2024

These two nitrogen-fixing legumes are frequently confused as seedlings. Both have compound leaves with leaflets of similar size and shape, and both are earlier colonizers of sunny, disturbed habitats. The robust, often reddish-colored stalk of partridge pea can lead it to be confused with a woody plant. Mature plants are wildly dissimilar, and young plants are easily distinguished by close examination of leaf structure.

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