Key to Hesperolinon

View taxon page for Hesperolinon

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

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

1. Petals yellow, often veined or tinged orange-red; anthers yellow

2. Leaf base clasping, margin 

serrate 

Having margins with sharp, fine to coarse teeth generally pointing tipward, not outward; margins with such teeth on such primary teeth are doubly serrate.

with 1–3 rows of prominent gland-tipped teeth ..... H. adenophyllum

2' Leaf base not clasping, margin neither serrate nor glandular

3. Styles generally 2 (occasionally some plants with both 2- and 3-carpellate flowers) ..... H. bicarpellatum (2)

3' Styles generally 3 (occasionally 2-carpellate flowers in 3-carpellate plants)

4. Styles generally 0.5–1 mm, 

included 

Not protruding out of surrounding structure(s) (e.g., stamens included in corolla).

; corolla not 

spreading 

Oriented more or less perpendicularly to the axis of attachment; often, more or less horizontal.

widely ..... H. clevelandii

4' Styles generally >= 2 mm, 

exserted 

Protruding out of surrounding structure(s) (e.g., stamens exserted from corolla).

; corolla spreading widely

5. Flowers generally clustered at inflorescence tips; stipular glands generally present throughout pl; petals 4–10 mm; filaments 4–8 mm ..... H. breweri

5' Flowers scattered, widely separated throughout inflorescence; stipular glands 0 or present only on proximal stem; petals <= 5.5 mm; filaments <= 4 mm

6. Stem, leaves generally glabrous, or stem 

puberulent 

Minutely hairy.

only above 

nodes 

Position on a stem from which one or more structures (especially leaves, buds, branches, or flowers) arise.

; petals 2–4 mm; styles generally 2–3.5 mm ..... H. bicarpellatum (2)

6' Stem, leaves generally puberulent; petals 3.5–5.5 mm; styles generally 3–10 mm ..... H. tehamense

1' Petals white to pink, often veined or tinged darker pink to purple; anthers white to pink or purple

7. Leaves 

whorled 

Arranged in groups of three or more at nodes or positions along an axis (e.g., three leaves per node).

(generally in 4s) on main stem, generally 3–6 mm wide, 

ovate 

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

, margin glandular ..... H. drymarioides

7' Leaves generally 

alternate 

1. Arranged singly, often spirally, along an axis - e.g., one leaf per node. 2. Occurring in different ranks, appearing to be between, not directly above or below, as 'stamens alternate petals'.

on main stem, <= 3 mm wide, thread-like to 

linear 

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

, margins not glandular

8. Styles 2 ..... H. didymocarpum

8' Styles generally 3 (occasionally some 2-carpellate flowers on 3-carpellate plants)

9. Inflorescence generally dense; 

pedicels 

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

generally <= 2 mm at flower (scattered flowers at lower nodes occasionally with pedicels to 5(10) mm), elongating in fruit; stipular glands generally present at leaves, bracts

10. Sepals glabrous; petals white to white flushed or veined with pink ..... H. californicum

10' Sepals hairy; petals light to dark pink ..... H. congestum

9' Inflorescence generally open; pedicels generally 1–25 mm at flower, to 45 mm in fruit; stipular glands 0 or minute, or present only at proximal leaves

11. Styles included; petals only slightly spreading, 0.5–3.5 mm, often <= sepals ..... H. micranthum

11' Styles exserted; petals widely spreading to 

reflexed 

Abruptly bent or curved downward or backward.

, 3–7 mm, > sepals

12. Pedicels straight in 

bud 

1. An incompletely developed, more or less embryonic shoot, usually covered with bud scales. 2. An unopened flower, often protected by sepals.

, not pendent ..... H. disjunctum

12' Pedicels pendent in bud ..... H. spergulinum

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