[1]

Boreau France

old M. S.

Wrong & useless

 

 

17

Boreau. Flore du Centre de la France

vars & very common species.

Old M.S.

Wrong & Useless

Decandolle p 465

 

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Boreau in Flore du Centre de la France. (1840) of Dicots. Gives

Genera Subtract culti plants.   Subtract Rosa, Rubus Salix

457 41 416 3 413

Species

1229 46 1183 27 1156} These are also subtracted from following calculation

 

First with respect to vars. (& Boreau makes a distinction between vars. with greek letter & variable genera)

Of the 413 genera, 100 have one or more vars, species with vars. & these 100 genera include 536 species, so they have on average 5.36. The remaining 313 (with no species having a var. have consequently (1156 - 536 =) 620 species, or on an average only 1.98 species to each genus. Or if we take whole Dicots we have 413/1156 (2.79

Secondly with respect to plants marked C.C. as most common. Of the 413 genera, 180 have one or more species marked C.C. & these 180 genera include 736 species, & therefore each genus has on average, 180/736 (4.08.

Consequently the remaining genera (413 - 180 =) 233 genera include (1156 - 736 =) 420 species, & each genus has on average 233/420 (1.80

The 180 genera have (180 + 75 =) 255 species, marked C.C. or on average each genus has 180/255 (1.41; so that this each 2 genera which have one very common species have almost 3 betwen them very common.

→ Being struck in the Labiatæ how many Genera with one species had this very common, I have calculated & find there are 16 genera with 48 species, so that each genus has on average 3.00 species. The remaining genera of Labiatæ (27 - 16 =) 11 without any C.C. species have altogether (62 - 48 =) 14 species, or on average only 1.27 species per genus, so even in this Fam. law hold good.

but more feebly

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Boreau in his Fl. of Monocots gives

Genera Subtract culti plants.   Subtract Carex on account of size

100 3 97 1 96

Species

355 9 336 53 283

96/283 (2.94

First with respect to vars.

Of the 96 genera, 22 have one or more species with vars, & these 22 genera include 152 species, ie on average each genus 6.90 species to genus. The remaining (96 - 22 =) 74 genera include (283 - 152 =) 131 species, or on average each of the genera, which has not one species with var, has 1.77 species to genus.

Secondly with respect to Monocots C.C. or very most common. Of the 96 genera, 32 have one or more species marked C.C. & these 32 genera include 165 species, & ∴ each has on average 32/165 (5.15. The remaining genera (96 - 32 =) 64, have include (283 - 165 =) 118 species, or on average 64/118 (1.84

The 9 32 genera have (32 + 17 =) 49 species marked C.C. therefore on average each of these genera has 1.53 species thus marked.

Dicots & Monocot. together.

Of Phanerogams B. gives Excluded from cultivation Rubus, Rosa, Salix & Carex

1584 65 1519 80 1439

spec

& 557 genera — 44 513 8 4 433 509/1439 (2.82 General average of species to genera with the exclusions.

 

First with respect to vars, of 509 genera, 122 have one or more species with marked varieties; these 122 genera include 688 species & therefore each genus has on average  122/688 (5.63. And the remaining genera (509 - 122 =) 387 genera include (1439 - 688 =) 751 species, or on average 387/751 (1.94

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Dicots & Monocot. together

Secondly with respect to plants marked C.C. Of the 509 genera, 212 have one or more species, marked C.C. & these 212 genera include 901 species, & ∴ on average have 212/901 (4.25. The remaining genera (509 - 212 =) 297, include (1439 - 901 =) 538 species & therefore have on average 297/538 (1.81

[in margin:] See about Labiatae Note

Altogether these are 212 genera include (212 + 92 =) 304 species marked C.C. so that each of these 212 genus has on average 1.43 common plants.

See my extract to show that he makes a marked difference between varieties & variations in the commonly diffused plants.—

For comparison with results calculated by Families in a different way see p 465 Decandolle.

If we take Families, I think (why?) whole world or at least whole continent shd be our field of comparison.— considering the wide extension of most Families

It wd be easy to calculate how many species in a genus have vars