Talk:Lansdell 862 (1920)
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Discussion for: Lansdell 862 (1920) • View • Links • Related changes
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Evidentiary scope
The database gives the locality as PRETORIA; GROENKLOOF and the date as 11 April 1920, with K. A. Lansdell as collector and 862 as the number. It records no habitat, use or note on cultivation, and no image of the label is published, so nothing shows whether the plant was cultivated, grew wild or had escaped. The accession is classified Unknown, and no conservation priority is assigned.
The Botanical Database of Southern Africa publishes no image of this sheet. Its image count is zero, and so is the image count of all 1,361,966 rows in the database: the store is empty, and SANBI's own site still lists plant images among its plans. The accession carries no image until the herbarium supplies a scan.
Georeferencing
The point -25.625, 28.125 is the one the herbarium database, BODATSA, publishes for this sheet. It is the centre of the quarter-degree square 2528CA, about 27 km across, and not the place the plant was gathered: BODATSA gives its accuracy, 1/4dg, and stores the square's code beside it. Of the 61 georeferenced Cannabis rows in BODATSA, all 41 flagged 1/4dg fall exactly on a square's centre and none of the other 20 does. BODATSA's LatLongChecked field is null on every Cannabis row, so no Cannabis coordinate in BODATSA has been verified by the herbarium. Groenkloof, the Pretoria suburb the label names (OpenStreetMap node 25456677), lies just outside the square, 2.8 km beyond its southern edge and 19.1 km from the point. The point is carried at the precision the database gives it. Basis: holder's georeference. Uncertainty: about 19 km.
Editorial treatment
The gathering is filed at Pretoria because PRE's entry is the dated one and the date it gives is internally consistent.
Source discrepancies
PRE dates this gathering 11 April 1920 and NH dates the same collector and number 1973. The accession carries PRE's date, which is the day-precise one and the one consistent with Kathleen Annie Lansdell's working life; NH's is recorded here and is not adopted. A specimen date that sits half a century after a sibling sheet is usually an accession or registration date. Both sheets need to be seen.
The same collector's number 630, at Barberton, is a separate undated accession.
Source citations remain in the article. Éloise 07:27, 24 September 2026 (+07)