Taxon Details

Aphyllon validum ssp. howellii

Howell's broomrape

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Taxon Summary:

Aphyllon validum ssp. howellii, commonly known as Howell's broomrape, is a perennial herb (parasitic) in the Orobanchaceae that is found only in California. It occurs within Chaparral (serpentinite, and volcanic), growing at elevations from 180 to 1740 meters. Aphyllon validum ssp. howellii is ranked 4.3, Plants of Limited Distribution, A Watch List; Not very threatened in California.

Classification

Scientific Name: Aphyllon validum (Jeps.) A.C. Schneid. ssp. howellii (Heckard & L.T. Collins) A.C. Schneid.
Common Name: Howell's broomrape
Family:	Orobanchaceae
Element Code:	PDORO040G1
USDA Plants Symbol:	ORVAH
Synonyms/Other Names: Orobanche valida ssp. howellii
Name Status:	JEF, FNA, POWO, IPNI, Tropicos

Conservation Status

CA Rare Plant Rank:	4.3
Fed List:	None
State List:	None
Global Rank:	G4T3
State Rank:	S3
Other Status:
CRPR Changes:
Add Date:	1984-01-01
Date Edited:	2023-05-02

Ecology and Life History

Lifeform: perennial herb (parasitic)

Blooming Period: Jun-Sep

Elevation:
180 - 1740 meters
590 - 5710 feet

General Habitats:

Chaparral (serpentinite, volcanic)

Microhabitat Details:

Microhabitat:

Notes

Notes: Generally parasitic on Garrya spp. See Madroño 29(2):95-100 (1982) for original description.
Threats:
Taxonomy:

Threat List Data from the CNDDB

THREAT LIST:
Threat List Total:	0
	Total EOs	% of EOs
EOs with Threat Listed:	0	0 %

Occurrence Data from the CNDDB

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

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

Presence:
Presumed Extant	0
Possibly Extirpated	0
Presumed Extirpated	0

Location

California Endemic:

California Island:

States: Name (Code)
California (CA)

California Counties and Islands: Name (Code)
Glenn (GLE), Lake (LAK), Mendocino (MEN), Napa (NAP), Sonoma (SON), Tehama (TEH)

Quads: Name (Quad Code)
Chiles Valley (3812253), Chrome (3912265), Detert Reservoir (3812265), Fouts Springs (3912236), Hough Springs (3912225), Jericho Valley (3812274), Knoxville (3812273), Mount St. Helena (3812266), Potato Hill (3912237), Riley Ridge (3912286), Sanhedrin Mtn. (3912351), The Geysers (3812277), Whispering Pines (3812276), Wilbur Springs (3912214)

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

Click on quad for name. Hold Shift Key to use mouse scroll wheel

CNPS Name Change:	Non-Substantive Name Changes: Orobanche to Aphyllon (2023)
Revised Nomenclature:	Phytokeys 75: 10-118 (2016)

CNPS Rare Plant Inventory