Key to Perideridia

View taxon page for Perideridia

(For a list of species in Perideridia, use the above link.)

Jepson Manual glossary definitions can be seen by moving your cursor over words underlined with dots.

1. Roots 

fibrous 

1. Pertaining to structures that are composed at least in part of more or less thread-like but usually tough elements (e.g., Yucca leaves). 2. Pertaining to a root system composed of many roots similar in length and thickness (e.g., grass roots).

or ± thickened, generally 5–20-clustered; styles 0.8–1 mm

2. Basal 

blade 

Expanded portion of a leaf, petal, or other structure, generally flat but sometimes rolled, cylindric, wavy, or cupped.

 leaflets widely 

lanceolate 

Narrowly elongate, widest in the basal half, often tapered to an acute tip.

to 

ovate 

Egg-shaped (i.e., widest below the middle) in two dimensions (i.e., in one plane), as a leaf.

, 10–40 mm wide; petals 5–7-veined; fruit ribs prominent ..... P. howellii

2' Basal blade leaflets 

linear 

Elongate, with nearly parallel sides; narrower than elliptic or oblong.

to lanceolate, 2–8 mm wide; petals 1-veined; fruit ribs thread-like ..... P. kelloggii

1' Roots tuberous, 2–6-clustered or 1; styles generally 1–2.5 mm

3. Basal leaves 1–2-ternate or 1–2-pinnate, with 1–3 pairs of 1° leaflets

4. Rays in fruit unequal, spreading-ascending; oil tubes per rib-interval 1 ..... P. lemmonii

4' Rays in fruit ± equal and 

ascending 

Curving or angling upward from base, or about 30-60 degrees less than vertical or away from axis of attachment.

, or unequal and spreading-ascending; oil tubes per rib-interval 3–4 ..... P. parishii

5. Rays generally 12–14, ± equal in fruit; bractlets ± = 

pedicels 

Stalk of an individual flower in an inflorescence, or the corresponding structure in fruit.

; fruit ovate to ± round, 2.5–3.5 mm ..... subsp. latifolia

5' Rays generally 6–11, unequal in fruit; bractlets generally < pedicels; fruit 

oblong 

Longer than wide, with nearly parallel sides; wider than linear.

to ± ovate, 3–5 mm ..... subsp. parishii

3' Basal leaves generally 1-pinnate with 3–5 pairs of 1° leaflets, or 2–3-pinnately or ternate-pinnately dissected or compound

6. Basal leaves generally 1-pinnate with 3–5 pairs of 1° leaflets – proximal 1° leaflets occasionally lobed or ternately dissected ..... P. gairdneri

7. Tuberous roots 2–3-clustered; petals 5- or 7-veined ..... subsp. borealis

7' Tuberous roots 1; petals 1-veined ..... subsp. gairdneri

6' Basal leaves 2–3-pinnately or ternate-pinnately dissected or compound

8. Terminal 

leaf 

Organ arising from a stem, generally composed of a stalk (petiole) and a flat, expanded, green, photosynthetic area (blade); distinguished from a leaflet by the presence in its axil of a bud, branch, thorn, or flower; sometimes with lateral, basal appendages (stipules); either simple (toothed, lobed, or dissected but not divided into leaflets) or compound (divided into leaflets).

 segments unlike lateral in size, form

9. Fruit 4–6 mm; bractlets scarious throughout, 3–9 mm, 

acuminate 

Having a long-tapered, sharp tip, the sides concave.

..... P. bolanderi subsp. bolanderi

9' Fruit 5–8 mm; bractlets scarious-margined, 1–4 mm, 

acute 

Having a short-tapered, sharp tip, the sides convex or straight and converging at less than a right angle.

10. Plant 5–15 dm; tuberous roots 

cylindric 

Elongate, with parallel sides and, at any point, round in transverse section.

, 5–12 cm; leaf segments flattened, 5–10 mm wide; oil tubes per rib-interval 1 ..... P. californica

10' Plant 3.5–7.5 dm; tuberous roots oblong to ovoid, 1–6 cm; leaflets cylindric, < 1 mm wide; oil tubes per rib-interval 3–4 ..... P. pringlei (2)

8' All leaf segments or leaflets similar in size, form

11. Longest rays in fruit 5–9 cm

12. 2° umbels generally spheric, generally 40–50(60)-flowered; 1° umbels ± concave distally, rays unequal; oil tube 1 per rib-interval ..... P. bacigalupii

12' 2° umbels convex distally, generally 20–25-flowered; 1° umbels convex distally, rays ± equal to unequal; oil tubes 3–4 per rib-interval ..... P. pringlei (2)

11' Longest rays in fruit 1–4.5 cm

13. Bracts 0–2, inconspicuous

14. Umbels strongly concave distally; rays in fruit unequal; fruit linear-club-shaped, 5–7 mm ..... P. leptocarpa

14' Umbels convex or flat distally; rays in fruit ± equal; fruit oblong, 3–6 mm ..... P. oregana (2)

13' Bracts 6–12, conspicuous

15. Bractlets widely scarious-margined, generally acuminate; oil tubes 2–3 per rib-interval ..... P. bolanderi subsp. involucrata

15' Bractlets narrowly scarious-margined, acute; oil tube 1 per rib-interval ..... P. oregana (2)

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