

Coneplant Hemitomes congestum
Coneplant is a perennial wildflower native to Canada and the lower 48 states. It blooms May – Aug.
More about this plant
Hemitomes is a monotypic genus of plants containing the single species Hemitomes congestum, which is known as gnome plant and cone plant. This rare and unusual plant is native to the west coast of North America from British Columbia to California, where it grows in dense, dark forests such as the redwood and Douglas-fir forests of the region. This is a small, fleshy, stemless perennial plant forming lumps in the leaf litter. It is white, yellowish, or reddish-pink in color, like Monotropa and other close relatives, little is known about the life cycle of the plant due to its rarity, but it probably obtains its nutrients by parasitizing fungi, that are part of the Russulaceae, in a similar manner to the rest of its tribe of the Monotropeae, so it lacks the green of chlorophyll. It grows from a rhizome with fragile roots and its form is covered in sparse scales which are the rudimentary leaves. An inflorescence emerges on a thick stalk from the soil bearing solitary to densely bunched flowers. The flowers have ragged yellowish or pinkish petals and contain hairs and large rounded yellow stigmas. The fruit is a fleshy white berry. Wikipedia →
Growing & care
USDA PLANTS · TRY- Hardiness
- ≥ zone 9 derived from its U.S. range
- Lifespan
- Perennial
- Flower colour
- Pink AI AI image-analysis of community-science photos (~87% expert agreement) — not a botanical record
How we know this (2) Methods & honest limits
We take the plant’s U.S. county range and look up each county’s long-term climate, then summarise: native rainfall = the median annual rainfall across its counties; heat tolerance = the warm end (90th percentile) of average temperature across its range (mirroring how our cold-hardiness floor uses an extreme). Counties + medians blunt the roadside/observer bias that makes point-level climate unreliable. Needs at least five placeable counties.
Honest limits: A realized, sampling-biased niche (where it has been recorded, not its physiological optimum), and county climate is coarse — large Western counties span deserts and mountains. Derived guide, never a measured fact.
McKenzie et al. assigned each species a flower colour with a GPT-4V vision model over iNaturalist photos. We use the confident tier plus a separately-labelled lower-confidence top-up (mostly inconspicuous green/brown flowers), and render it as a small tint — never as an asserted fact, and kept out of the written synopsis.
Honest limits: AI image inference (~87% expert agreement on the confident tier); a decorative, confidence-tiered indicator, not a measured trait.
Sources for this entry (14) Open & cited
Cite this page Open data, please attribute
PlantKey’s data is open under CC BY-SA 4.0 — free to reuse and adapt, with attribution and the same licence. Photos keep their own per-image licence + credit (see Sources above).
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