Philadelphus microphyllus
Littleleaf mock orange, Littleleaf Mock Orange
(c) Brian Finzel, some rights reserved (CC BY-SA), uploaded by Brian Finzel · licence
Family: Hydrangeaceae · Type: Shrub · Native
Philadelphus microphyllus (Littleleaf mock orange) is a native California shrub in the Hydrangeaceae family, recognized by clear leaf size, margin, and habitat differences.
Littleleaf mock orange is a California native shrub found in the eastern Peninsular Ranges, specifically the Santa Rosa Mountains, western Inyo Mountains, and eastern desert mountains at elevations of 1,340 to 3,350 meters. Flowering from May to July, this plant produces white flowers with widely elliptic petals 6 to 8 millimeters long. Growing with upright branches up to 2 meters tall, it forms a dense, compact shrub in rocky mountain landscapes. Its leaves are small and delicate, with narrow ovate to elliptic blades 3 to 8 millimeters wide, featuring margins that are slightly rolled under and attached to slender petioles 5 to 18 millimeters long. In rocky pinyon and juniper woodlands, this mock orange creates subtle, elegant patches of greenery against rugged mountain terrain.
Identification and appearance
Key characters: 1 sympatric species; clear leaf size, margin, and habitat differences
Habitat and range
Habitat: Rocky slopes, cliffs, pinyon/juniper woodland
Elevation: 1340-3350 m
California counties: Inyo, San Bernardino, Riverside, Mono, Nevada
Outside California: to Texas, northern Mexico
Bloom period
Philadelphus microphyllus blooms May-Jul.
How to tell it apart
vs Rosa: Philadelphus has simple opposite leaves; roses have alternate compound leaves with leaflets.; vs Carpenteria: Philadelphus has deciduous three-veined leaves; Carpenteria has evergreen leathery leaves with one vein.; vs Cornus: Philadelphus leaves have three veins from the base; dogwoods have pinnate veins arching toward the tip.; vs Pittosporum: Philadelphus has opposite leaves and multiple styles; Pittosporum has alternate leaves and one style.; vs Rhododendron: Philadelphus has thin deciduous leaves; rhododendrons have thick evergreen leaves and bell-shaped flowers.
Frequently asked questions
Is Philadelphus microphyllus native to California?
Yes. Philadelphus microphyllus is native to California (recorded as native).
When does Philadelphus microphyllus bloom?
Philadelphus microphyllus blooms May-Jul.
Where in California does Philadelphus microphyllus grow?
Philadelphus microphyllus occurs in Inyo, San Bernardino, Riverside, Mono, Nevada, at elevations of 1340-3350 m.
What plant family does Philadelphus microphyllus belong to?
Philadelphus microphyllus is in the Hydrangeaceae family, genus Philadelphus.
What habitat does Philadelphus microphyllus grow in?
Philadelphus microphyllus grows in Rocky slopes, cliffs, pinyon/juniper woodland.
Related species
Other California species in the same genus, family, or bioregion.
Sources: Jepson eFlora · Index of California Plant Names · CalPhotos
Last updated 2026-10-07
Data from The California Species Project — 14,000+ California species with verified data from CNPS, CDFW, USFWS, Cal-IPC, and more.