Perideridia parishii
Parish's Yampah
basal 1-ternate or 1-pinnate, primary leaflets 5 or 7, sometimes simple;
petiole 3–10 cm;
blade ± ovate, 10–20 cm, primary leaflets undivided, basal sometimes deeply lobed, ultimate divisions monomorphic, ± lanceolate, 30–150 mm, margins entire;
cauline leaves 1-ternate.
3–20 cm.
concave, flat, or convex distally;
involucral bracts 0–2, bristle-shaped;
rays (5–)6–14(–20), 1–4.5 cm, in fruit ± equal and ascending, or unequal and spreading-ascending;
involucel bractlets 3–8, linear-lanceolate, 1–4 mm, scarious-margined;
umbellets convex, 13–27-flowered.
3–4 mm.
petals 1-veined;
styles 1–1.5 mm, spreading and usually recurved.
oblong to ovate or ± globose;
mericarps 1.8–5 mm;
ribs threadlike;
oil ducts 3–4 in intervals, 6 on commissure.
Perideridia parishii
Subspecies 2 (2 in the flora).
Plants of Perideridia parishii greatly resemble those of P. lemmonii; the only consistent distinction between them is that mericarps of P. parishii have 3 or 4 oil ducts in the intervals and 6 on the commissure whereas those of P. lemmonii have 1 in the intervals and 2 on the commissure.
(Discussion copyrighted by Flora of North America; reprinted with permission.)
1. Rays (5–)6–11(–13), unequal in fruit; involucel bractlets usually shorter than pedicels; schizocarps oblong to ± ovate; mericarps 3–5 mm. | subsp. parishii |
1. Rays (8–)12–14(–20), ± equal in fruit; involucel bractlets ± equal to pedicels; schizocarps ovate to ± globose; mericarps 1.8–3.5 mm. | subsp. latifolia |
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