Tuberous Indian-plantain (Arnoglossum plantagineum) COSEWIC assessment status report : chapter 12

Range of Occurrence in Canada:

Ontario

extent of occurrence (EO) (km²)

>1000

specify trend (decline, stable, increasing, unknown):

stable

are there extreme fluctuations in EO (> 1 order of magnitude)?

no

area of occupancy (AO) (km²)

perhaps <20

specify trend (decline, stable, increasing, unknown):

possibly slight decline in area

are there extreme fluctuations in AO (> 1 order magnitude)?

no

number of extant locations:

about 13 recent; 6 historic and 1 recent loss [NHIC has 14 recent and 9 historic or extirpated in its database]

specify trend in # locations (decline, stable, increasing, unknown):

trend unclear

are there extreme fluctuations in # locations (>1 order of magnitude)?

no

habitat trend: specify declining, stable, increasing or unknown trend in area, extent or quality of habitat:

possibly slight decline in habitat availability

generation time (average age of parents in the population) (indicate years, months, days, etc.):

unknown

number of mature individuals (capable of reproduction) in the Canadian population (or, specify a range of plausible values):

roughly 5000 flowering and perhaps several times this number including vegetative shoots

total population trend: specify declining, stable, increasing or unknown trend in number of mature individuals:

no trend evident but 1998 survey may have been more thorough with more plants counted

if decline, % decline over the last/next 10 years or 3 generations, whichever is greater (or specify if for shorter time period)

are there extreme fluctuations in number of mature individuals (> 1 order of magnitude)?

no

is the total population severely fragmented (most individuals found within small and relatively isolated (geographically or otherwise) populations between which there is little exchange, i.e., < 1 successful migrant / year)?

No, but localities are clumped in several areas of suitable habitat

list each population and the number of mature individuals in each:

see text

specify trend in number of populations (decline, stable, increasing, unknown):

stable (only 1 recent loss but also 6-9 historic losses]

are there extreme fluctuations in number of populations (>1 order of magnitude)?

no

Rescue Effect (immigration from an outside source):

low

does species exist elsewhere (in Canada or outside)?

USA

status of the outside population(s)?

widespread in east central USA

is immigration known or possible?

not likely

would immigrants be adapted to survive here?

yes

is there sufficient habitat for immigrants here?

yes