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Vascular Plants of California
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Holodiscus discolor var. microphyllus

Higher Taxonomy
Family: RosaceaeView DescriptionDichotomous Key
Common Name: ROSE FAMILY
Habit: Annual to tree, glandular or not. Leaf: simple to palmately or pinnately compound, generally alternate; stipules free to fused (0), persistent to deciduous. Inflorescence: cyme, raceme, panicle, cluster, or flowers 1; bractlets on pedicel ("pedicel bractlets") generally 0--3(many), subtended by bract or generally not. Flower: generally bisexual, radial; hypanthium free or fused to ovary, saucer- to funnel-shaped, subtending bractlets ("hypanthium bractlets") 0--5, alternate sepals; sepals generally 5; petals generally 5, free; stamens (0,1)5--many, anther pollen sacs generally 2; pistils (0)1--many, simple or compound, ovary superior to inferior, styles 1--5. Fruit: 1--many per flower, achene (fleshy-coated or not), follicle, drupe, or pome with generally papery core, occasionally drupe-like with 1--5 stones. Seed: generally 1--5 (per fruit, not per flower).
Genera In Family: 110 genera, +- 3000 species: worldwide, especially temperate; many cultivated for ornament, fruit, especially Cotoneaster, Fragaria, Malus, Prunus, Pyracantha, Rosa, Rubus. Note: Number of teeth is per leaf or leaflet, not per side of leaf or leaflet, except in Drymocallis.
eFlora Treatment Author: Daniel Potter & Barbara Ertter, family description, key to genera, treatment of genera by Daniel Potter, except as noted
Scientific Editor: Daniel Potter, Thomas J. Rosatti.
Genus: HolodiscusView Description 

Habit: Shrub, +- hairy. Leaf: simple, alternate, toothed; stipules 0. Inflorescence: raceme or panicle, terminal, many-flowered, persistent; pedicels slender, bractlets 1--3, linear. Flower: hypanthium saucer-shaped, prominent nectary-disk below inner rim, bractlets 0; petals generally white; stamens 15--20; pistils 5, ovaries superior, 2-ovuled, hairs dense, bristle-like, persistent in fruit, style persistent, stigma +- 2-lobed. Fruit: achenes 5.
Etymology: (Greek: whole disk)
eFlora Treatment Author: Daniel Potter
Species: Holodiscus discolorView DescriptionDichotomous Key

Habit: Plant 0.3--6 m. Stem: bark +- red, in age gray, shredding; twigs glabrous to hairy, occasionally glandular. Leaf: 0.3--8 cm, ovate to obovate, strong-veined abaxially, glabrous to hairy, occasionally glandular, teeth entire to compound; base truncate to wedge-shaped; petiole distinct or not. Inflorescence: 2--25 cm, 1.5--25 cm wide. Flower: hypanthium 3--5 mm wide; sepals 1--2 mm; petals 1.5--2 mm; style 1 mm. Fruit: achenes 1--1.5 mm, often with sessile glands.
Note: Highly variable; varieties intergrade.
Unabridged Note: Highly variable; varieties intergrade, especially. var. discolor and var. microphyllus. Intermediate plants from SNH, SNE, described as Holodiscus saxicola A. Heller, Holodiscus boursieri (Carrière) Rehder, do not merit taxonomic status.
Holodiscus discolor (Pursh) Maxim. var. microphyllus (Rydb.) Jeps.
Habit: Plant 0.3--1 m, +- dense. Stem: twigs hairy to long-hairy; glands 0 or obscured by hairs. Leaf: petiole generally indistinct; blade 0.3--3 cm, +- round to obovate, +- long-hairy on 1 or both surfaces, hairs not greatly longer on margins, veins, glands 0 or generally obscured by hairs, teeth entire, above middle, base generally wedge-shaped. Inflorescence: generally 2--8 cm, 1.5--5 cm wide; branches 0--few.
Ecology: Rocky places, outcrops; Elevation: 1100--4000 m. Bioregional Distribution: SNH, SnGb, SnBr, SnJt, SNE, DMtns; Distribution Outside California: to Oregon, Idaho, Wyoming, Colorado, Arizona, Baja California. Flowering Time: Jun--Sep
Synonyms: Holodiscus microphyllus Rydb.; Holodiscus microphyllus Rydb. var. microphyllus
Jepson eFlora Author: Daniel Potter
Index of California Plant Names (ICPN; linked via the Jepson Online Interchange)

Previous taxon: Holodiscus discolor var. glabrescens
Next taxon: Horkelia

Botanical illustration including Holodiscus discolor var. microphyllusbotanical illustration including Holodiscus discolor var. microphyllus

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Citation for this treatment: Daniel Potter 2022, Holodiscus discolor var. microphyllus, in Jepson Flora Project (eds.) Jepson eFlora, Revision 10,, accessed on July 23, 2024.

Citation for the whole project: Jepson Flora Project (eds.) 2024, Jepson eFlora,, accessed on July 23, 2024.

Holodiscus discolor  
var. microphyllus
click for image enlargement
©2003 Michael Charters
Holodiscus discolor  
var. microphyllus
click for image enlargement
©2000 Larry Blakely
Holodiscus discolor  
var. microphyllus
click for image enlargement
©2011 James M. Andre
Holodiscus discolor  
var. microphyllus
click for image enlargement
©2003 Michael Charters
Holodiscus discolor  
var. microphyllus
click for image enlargement
©2000 Larry Blakely

More photos of Holodiscus discolor var. microphyllus
in CalPhotos

Geographic subdivisions for Holodiscus discolor var. microphyllus:
SNH, SnGb, SnBr, SnJt, SNE, DMtns
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map of distribution 1

(Note: any qualifiers in the taxon distribution description, such as 'northern', 'southern', 'adjacent' etc., are not reflected in the map above, and in some cases indication of a taxon in a subdivision is based on a single collection or author-verified occurrence).


Data provided by the participants of the  Consortium of California Herbaria.

View all CCH records
All markers link to CCH specimen records. The original determination is shown in the popup window.
Blue markers indicate specimens that map to one of the expected Jepson geographic subdivisions (see left map). Purple markers indicate specimens collected from a garden, greenhouse, or other non-wild location.
Yellow markers indicate records that may provide evidence for eFlora range revision or may have georeferencing or identification issues.

CCH collections by month Flowering-Fruiting Monthly Counts

Duplicates counted once; synonyms included.
Species do not include records of infraspecific taxa, if there are more than 1 infraspecific taxon in CA.
Blue line denotes eFlora flowering time (fruiting time in some monocot genera).