Taxon Report
Stylocline masonii MorefieldMason's neststraw |
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Taxon Summary
Stylocline masonii, commonly known as Mason's neststraw, is a annual herb in the Asteraceae that is found only in California. It occurs within Chenopod scrub, and Pinyon and juniper woodland, growing at elevations from 100 to 1200 meters. Stylocline masonii is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.Classification
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Scientific Name: |
Stylocline masonii Morefield |
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Common Name: |
Mason's neststraw |
| Family: | Asteraceae |
| Element Code: | PDAST8Y080 |
| USDA Plants Symbol: | STMA10 |
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Synonyms/Other Names: |
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Ecology and Life History
| Lifeform: | annual herb |
| Blooming Period: Mar-May | Mar-May |
| Elevation: | 100-1200 (330-3935) |
| General Habitats: | Chenopod scrub, Pinyon and juniper woodland |
| Microhabitat: | Gravelly, Sandstone, Sandy |
| Microhabitat Details: | On gravelly, loose sand in openings of washes, alluvial fans, flats, benches on hillslopes, and ridgetops. |
Conservation Status
| CA Rare Plant Rank: | 1B.1 |
| Global Rank: | G1 |
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State Rank: |
S1 |
| State List: | None |
| Fed List: | None |
| Other Status: | |
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CRPR Changes: |
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Occurrence Data from the CNDDB
| Total Occurrences: | 7 |
| Element Occurrence Ranks: | |
| Excellent (A) | 0 |
| Good (B) | 0 |
| Fair (C) | 0 |
| Poor (D) | 0 |
| None (X) | 1 |
| Unknown (U) | 6 |
| California Endemic: True | |
| California Counties and Islands: Name (Code) | |
| Kern (KRN), Los Angeles (LAX), Monterey (MNT), San Luis Obispo (SLO) | |
| Quads: Name (Quad Code) | |
| Acton (3411842), Bryson (3512171), Camatta Canyon (3512053), Camatta Ranch (3512043), Cholame (3512063), Cholame Valley (3512073), Hames Valley (3512088), Rosedale (3511942), Tierra Redonda Mountain (3512078), Weldon (3511863), Williams Hill (3512181) | |
Threat List Data from the CNDDB
| Threat List Total: | 2 | |
| EOs with Threat Listed: | Total EOs | % of EOs |
| 4 | 57 % | |
| Development | 3 | 42% |
| Dam/Inundation | 1 | 14% |
Notes
| Previously collected only once (1991) since 1971; most of known sites surveyed unsuccessfully in 1989. See Madroño 39(2):117 (1992) for original description and 43(3):434-435 (1996) for information on 1991 collection. |
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Threats: |
| Threatened by development, non-native plants (Schismus arabicus), habitat disturbance, and altered fire regimes. |
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Taxonomy: |
Citation
California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 24 June 2025].