[27]

Monocot. Plants

Zannichella 1
Ruppia 1
Potamogeton 16
Platanthera 16
Sisynchnium Sisyrinchium 1
Smilax 9
Trillium 6.
Juncus 20
Pontederia 1
Cyperus 15
Fuesira 1
Eleocharis 16
Suipus 14
Eriophorum 5
For Dicots on Back of Page th average is 8.6 14    122

Carex 126
Agrostis XX 6
Sclerochlora 1
Eragrostis 5
Festuca 6
Bromus 5
Elymus XX 4
Panicum XX 19
Tripsacum 1
[totals] 9 [+] 14 [=] 23    173 [+] 122 [=] 295 [÷] 23 [=] 12.8
Hence 12.8 per genus
But leavg out Carex, the avr 169 [÷] 22 [=] 7.6

Dicots & Monocots together

(V Last Calc.)

Genera 45 [+] 23 [=] 68    387 [+] 295 [÷*] 68 [=] 10.00 average species to genus in those genera which have 1 or more species with vars.

If we leave out Carex (with 126 sp the result is 8.3 → That is one.

If we leave out all Salix with 22 species the result is 8.09

If we leave out Carex, Aster & Solidago, the largest genera the result is 7.5 per genus.

(Now in U.S of all Dicots the average species per genus is only 2.68. for monocots 3.65, (without Carex it is 2.86)

For both Monocot & Dicot it is 2.90 species per genus

So that clearly the it is the large genera which present varieties. And judging from Compositæ it is the large Families which vary most.

For both Mono & Dicot. together omitting Carex with 126 sp the average for each genus is 2.72. (or 2.70 with Salix also omitted.

There are only 10 genera out from the 68 which have 2 or more species with vars.

These 10 have 104 species, or on average 10.40 to genus (carex & salix omitted). The grand average, with same omissions, for whole manual; genera with single species being omitted, is only 4.67. But as these are only 10 genera, the result of not much value.

Used

[27v]

Dr. A. Gray's manual. Genera which have one or more species presenting varieties. I have counted those vars which are either named or numbered, & in a few instances vars. described but not named or enumerated Several plants are said to be very variable in this or that point, but are not said to present distinct vars. The number of X show how many species in the Genus have vars. —

Anemone 5
Actaea var. not nmberd or named. 2
Ranunculus 16
Cardamine 5
Viola 17
Helianthemum var. not nmberd 2
Spergularia 1
Acer 5
――
Vicia 6
Lespedoza XX 6
Potentilla 9
Rubus 10
Pyrus 4
Amelanchier 1
Oenothera 7
Myriophyllum 6
Lonicera 8
Viburnum 9
Galium XX 10
Hedyotis 5
――
Liatus 5
Aster 35
Solidago 31
Eclipta 1
Ambrosia 2
Silphium XX 5
Xanthium 3
Haliopsis 1
Helianthm XXX 16
29    233

Artemisia 6
Antennaria 2
Senecio 3
Knigia 1
Hieracium 6
Nabalus XX 9
Lactuca 1
――
[illeg] 4
Vaccinium 12
Azalea 4
Kalmia 3
Pyrola 6
Lysimachia 5
Galeopsis 2
Phlox 8
Calyostegia 2
Datura 1
Gentiana XX 9
Apocynum 2
Asclepias 12
Chenopodium 5
Polygonum XX 20
Carya 6
Salix XXXX 22
Boehmeria 1
Juniperus 2
26 [+] 29 [=] 45 should be '55    154 [+] 233 [=] 387 [÷*] 45 [=] 8.60 should be '7.04
☞ See if many of these same genera (avoiding same species) which have vars in Henslows List ☞ Compos. most varialbe & largest Fam in U. States (?)