Taxon Details

Nemacladus twisselmannii var. botanywomaniae

Botany Woman's threadplant

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Photo of Nemacladus twisselmannii var. botanywomaniae

Taxon Summary:

Nemacladus twisselmannii var. botanywomaniae, commonly known as Botany Woman's threadplant, is a annual herb in the Campanulaceae that is found only in California. 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:
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	1B.1
Fed List:	None
State List:	None
Global Rank:	G1T1
State Rank:	S1
Other Status:
CRPR Changes: added to 1B.1 on 2023-04-26
Add Date:	2023-03-22
Date Edited:	2025-10-29

Ecology and Life History

Lifeform: annual herb

Blooming Period: Apr(May)

Elevation:
1170 - 1215 meters
3840 - 3985 feet

General Habitats:

Chaparral

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.

Microhabitat:

Sandy

Notes

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

Threat List Data from the CNDDB

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

Occurrence Data from the CNDDB

Element Occurrence Ranks:
Total Occurrences:					2
A	B	C	D	X	U
0	0	0	0	1	1

Occurrence Status:
Historical >20 Years	0
Recent <=20 Years	2

Presence:
Presumed Extant	1
Possibly Extirpated	1
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
San Diego (SDG)

Quads: Name (Quad Code)
Tubb Canyon (3311624)

Notes:

Definitions of codes following a county and/or quad:
*		Presumed extirpated
(?)		Occurrence confirmed, but possibly extirpated
Quad and county data is imported from the CNDDB. Species may be present in other areas where conditions are favorable. These data should NOT be substituted for pre-project review or for on-site surveys.

Regional Map

Map

Presumed Extant

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CNPS Status Review:	Proposed addition to CRPR 1B.1, G1 / S1 (2023)
Original Description:	Madroño 67(1): 35–60 (2020)

CNPS Rare Plant Inventory