Taxon Report

Nemacladus twisselmannii J. T. Howell var. botanywomaniae Morin & T. J. Ayers

Botany Woman's threadplant

Print Report

Species Description:
Nemacladus twisselmannii var. botanywomaniae, commonly known as Botany Woman's threadplant, is a annual herb in the Campanulaceae that is . It occurs within Chaparral, growing at elevations from 1170 to 1215 meters. Nemacladus twisselmannii var. botanywomaniae is ranked 1B.1, Plants Rare, Threatened or Endangered in California and Elsewhere; Seriously threatened in California.

Classification


Scientific Name:	Nemacladus twisselmannii J. T. Howell var. botanywomaniae Morin & T. J. Ayers
Common Name:	Botany Woman's threadplant
Family:	Campanulaceae
Element Code:	PDCAM0F0D1
USDA Plants Symbol:
Synonyms/Other Names:

Ecology and Life History


Lifeform:	annual herb
Blooming Period: Apr(May)	Apr(May)
Elevation:	1170-1215 (3840-3985)
General Habitats:	Chaparral
Microhabitat:	Sandy
Microhabitat Details:	Sparsely distributed on sandy flats in or immediately adjacent to gently sloping washes in deep, quartz-rich sand in the desert transition zone.

Conservation Status


CA Rare Plant Rank:	1B.1
Global Rank:	G1T1
State Rank:	S1
State List:	None
Fed List:	None
Other Status:
CRPR Changes:	added to 1B.1 on 2023-04-26

Occurrence Data from the CNDDB


Total Occurrences:	2
Element Occurrence Ranks:
Excellent (A)	0
Good (B)	0
Fair (C)	0
Poor (D)	0
None (X)	1
Unknown (U)	1

Location


California Endemic: False
California Counties and Islands: Name (Code)
San Diego (SDG)
Quads: Name (Quad Code)
Tubb Canyon (3311624)

Threat List Data from the CNDDB


Threat List Total:	2
EOs with Threat Listed:	Total EOs	% of EOs
	2	100 %
Non-native plant impacts	2	100%
Erosion/runoff	1	50%

Notes




Threats:
Threatened by non-native plants, fire suppression activities (foot traffic), and erosion
Taxonomy:
Similar to but disjunct from var. twisselmannii and found in different habitat at lower elevations; differentiated morphologically by its non-resupinate flowers and deltate sepals

Selected References

Proposed addition to CRPR 1B.1, G1 / S1 (2023)

Madroño 67(1): 35–60 (2020)

Citation California Native Plant Society, Rare Plant Program. 2025. Rare Plant Inventory (online edition, v9.5.1). Website https://www.rareplants.cnps.org [accessed 20 January 2025].