Field ManualAll plants

Lantrisco

Rhus pachyrrhachis Hemsl.

Family: Anacardiaceae

Pet & Human Safety

People: Skin irritant to peoplePets: Not on the ASPCA lists as we read them

Hazardous parts

Not yet checked.

Preparation

n/a

Hazard type

Not yet checked.

Hazard route

Not stated by our sources (not a clearance). Detail: for this species. Family level only (Flora del Bajio): Anacardiaceae often have resinous bark and some species an oily liquid that causes allergic reactions; the same fascicle says a neighbouring genus is highly irritant and that Toxicodendron sap causes dermatitis in many people. No statement is made for Rhus pachyrrhachis itself

How complete this information is

We have not researched the safety of this plant yet.

Toxic to pets

No ASPCA entry found.

ASPCA index has no page for this species. Do not treat as pet-safe.

PlotAndPetal cannot tell you whether a plant you found can be eaten. Only someone who can see the plant can identify it.

Look-alike warning

Could be mistaken for Other plants with a similar name or look. To tell them apart: Match on the scientific name, Rhus pachyrrhachis Hemsl. (Flora del Bajio and Kew WCVP agree), not on the common name.. Flora del Bajio gives the same common name "lantrisco" to Rhus schiedeana, and says its Bajio specimens of R. pachyrrhachis cannot always be told apart from R. schiedeana or R. virens var. virens; the whole group needs revision. Kew WCVP also lists the plant under the old genus name Schmaltzia. It is a Rhus (sumac), not Toxicodendron (poison ivy group).

Poison control

If someone has collapsed, cannot be woken, is having a seizure or has trouble breathing, call 911 now. For any other possible poisoning, call Poison Help: 1-800-222-1222.

Emergency number source: U.S. federal law (47 U.S.C. § 251(e)(3)), read 2026-10-07.

Naturalist Lore

Historical Background & Breeding Lore

The history of this plant and its name, and how it was bred, where we have them.

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Care

Hardiness zones: Not checked yet
Light: half shade ("media sombra") (Celaya planting table).
Water needs: Celaya municipal planting schedule (a weak source for plant needs): water every third day while establishing, then weekly. The level is a plain-language reading of the source wording cited. Always finger-test two inches down.
Mature size: MX: Flora del Bajio: up to 6 m (about 20 ft) tall; MX Celaya table: Celaya planting table: 2 m to 6 m tall, crown 2 m

Soil & Drainage

Pruning & Flush Rhythm

Feeding Schedule

How to prepare the soil, when and what to feed, and how and when to prune where that applies.

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