Rosaceae

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Oemleria cerasiformis “Indian Plum” Rosaceae

Washington Park Arboretum, Seattle, WA
May 9, 2016
Robert Niese

Oemleria is a PNW endemic and is one of the first plants to leaf-out and bloom in spring. Later in the summer Oemleria will begin to bear ripe fruits which are purple with a large pit, giving them the name Indian Plums. Opinions vary on the palatability of these fruits. Some find them to be among the best in the PNW, while others find them too bitter. Generally, their astringency can be reduced through cooking and, as such, Oemleria fruits tend to be most commonly prepared in jams and pie fillings. Also, their bark is thought to be a mild aphrodisiac. Someone should try chewing on a few twigs and report back to us all.

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Rosa gymnocarpa “Baldhip Rose” Rosaceae

Weir Hot Springs, Clearwater National Forest, ID
June 8, 2015
Robert Niese

This is one of North America’s smallest rose species and, as such, it is often nicknamed the “dwarf rose.” I prefer the name “baldhip” though. Not only does it sound wonderfully silly, but it also is a direct translation (more or less) of the species epithet, “gymnocarpa.” Well, gymnocarpa really means “naked fruit,” but their fruits are hips and these hips are indeed bald. When the flower is fertilized, its petals and sepals fall off, leaving behind the growing fruit. Most roses hang on to their sepals as their hips mature, making this a reliable feature for identifying R. gymnocarpa. Look for these small shrubs in low- to mid-elevation moist forests throughout the PNW. This little corner of western Montana is their eastern-most range edge!

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Amelanchier alnifolia “Western Serviceberry/Saskatoon” Rosaceae

Missoula, MT
April, 25 2015
Robert Niese

These common shrubs are some of the first plants to bloom in spring. Their bright white flowers light up our hillsides just as they’re starting to turn green. This plant was a staple food source for many native peoples who ate their berries raw (although they’re not as moist or sweet as other Rosaceae berries) or mashed them and shaped them into biscuits which were dried and stored for winter (side note: serviceberry is also a common ingredient in pemmican, which often is stored in biscuit shapes, so this note about dried biscuits could be a reference to pemmican, and saskatoon biscuits might not be a real thing…I’m not sure. Do any of my followers know?). Today, many local foragers will utilize these berries in jams and pies and often sweeten them for trail mixes and granola.

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Geum macrophyllum “Large-leaf Avens” Rosaceae

Weir Hot Springs, Clearwater National Forest, ID
June 8, 2015
Robert Niese

This little forest flower is common throughout moist bottomlands and subalpine meadows here in the PNW. It can be easily distinguished from other yellow-flowered Avens by its massive leaves and reflexed sepals (they’re not visible behind the petals here). Avens characteristically produce adorable heads of achenes that look like tiny sea urchins. In its cousin, Old Man’s Whiskers (Geum triflorum), these achenes have a long feathery tip and look like wisps of smoke.

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Gymnosporangium globosum “Cedar-Hawthorn Rust” Basidiomycota

Missoula, MT
October 23, 2015
Robert Niese

I first noticed these strange tendrils on the underside of Hawthorn (Crataegus douglasi) at a city park a couple months ago, but only just got around to photographing them. I thought they might be some sort of aphid galls after noticing that the leaves were covered with the insects. But the truth, it turns out, is far more spectacular! This is actually the fall life-stage of a rust fungus that infects Cedars (and Junipers). The fungus overwinters on Cupressaceous conifers, producing a small gall that grows large, orange gelatinous horns after spring rains. These jelly tentacles release spores that then infect the leaves of Rosaceous trees and shrubs such as Crataegus, Malus, and Sorbus. By late summer, fungi on these Rosaceous hosts produce the large porcupine-like clump of tendrils seen here. These tendrils release more spores that continue the cycle anew! I’m in love. What a phenomenal fungus!

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Holodiscus discolor “Oceanspray” Rosaceae

Mt. Sentinel, Lolo National Forest, MT
September 12, 2015
Robert Niese

Oceanspray is one of my favorite plants here in the PNW. It’s a modest-sized shrub that grows foamy white inflorescences that brighten up nearly all open hillsides west of the Rocky Mountains in the spring. These inflorescences are long-lived and fade to a creamy beige that contrasts nicely with their rich green foliage throughout the summer. In the fall, Oceanspray leaves begin changing early in the season and progress through a rainbow of colors until becoming a uniform maroon-scarlet after the first frosts of October. These plants have a very tough wood that is resistant to fire and are regularly the first plants to recolonize areas following a burn.

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Physocarpus malvaceus “Mallow Ninebark” Rosaceae

Mt. Sentinel, Lolo National Forest, MT
September 12, 2015
Robert Niese

Ninebark is one of those plants I only begin noticing in the fall when their leaves turn scarlet. In the summer they briefly bloom small white flowers, but their petals quickly drop, leaving behind a green-red calyx that is easy to overlook. Along with the fact that these rosaceous plants don’t produce edible fruits (dry follicles, as you can see here), Physocarpus is a very underappreciated member of our dry Ponderosa Pine forests. But it plays a critical role in these fire-prone ecosystems and is a hardy pioneer species following all kinds of disturbances.

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Spiraea densiflora (splendens) “Subalpine Spiraea” Rosaceae

Great Burn, Lolo National Forest, MT
July 10, 2015
Robert Niese

 

This species of Spiraea is a popular garden plant thanks to beautiful, fragrant pom-pom inflorescences. In the wild, it commonly inhabits moist, rocky slopes throughout the PNW. If you’d like to propagate your own, check out these instructions for collecting and germinating seeds.

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Prunus virginiana “Chokecherry” Rosaceae

Drinking Horse Mountain, Bozeman, MT
June 3, 2015
Robert Niese

Chokecherry is a native species of cherry that is abundant on the drier, east-facing mountain slopes of the PNW. It was a staple food for many tribes in our area and is still regularly harvested by many native peoples. Each small fruit has a pit in the center (like a cherry) which can make its preparation difficult. Check out Abe Lloyd’s blog for details and recipes for things like Chokecherry fruit-leather, jam, and wine.

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Potentilla gracilis “Slender Cinquefoil” Rosaceae

Lolo National Forest, Bitterroot Mountains, MT
May 10, 2015
Robert Niese

Cinquefoils are named for their 5-parted leaves, although many members of Potentilla lack these characteristic leaf shapes. Potentilla fruits are aggregate fruits like raspberries and blackberries and, while completely edible, they are said to taste horrid.