of this surmise we must have better evidence as to
what the original condition really was than we have at present.

The proximate cause of irregular peloria has been considered to be
excess of nourishment, but evidence as to this point is very
conflicting. Willdenow states that "radices peloriae, solo sterili
plantatae, degenerant in Linariam," ('Sp. Plant.,' iii, p. 254); but this
opinion is counterbalanced by that of others, while the frequent
existence of both forms on the same plant, at the same time, seems to
negative the supposition of any direct effect from external
circumstances.

The following are the plants in which irregular peloria has been most
often observed:

Aconitum Napellus.
Delphinium elatum!
Corydalis tuberosa.
*Viola odorata!
hirta.
Impatiens Balsamina.
Clitoria Ternatea.
Cytisus Laburnum!
Trifolium repens!
Lupinus polyphyllus!
*Gloxinia, var. cult.!
*Linaria vulgaris!
spuria.
Elatine.
triphylla.
aeruginea.
triornithophora.
pilosa.
chalepensis.
cymbalaria!
purpurea!
decumbens.
Pelisseriana.
origanifolia.
Digitalis orientalis.
* purpurea!
Calceolaria crenatiflora.
rugosa.
* var. cult.!
Chelone barbata.
*Antirrhinum majus!
Rhinanthus crista galli.
Pedicularis sylvatica.
Pedicularis euphrasioides.
Scrophularia aquatica!
Sesamum indicum.
Lamium.
Mentha.
Sideritis.
Nepeta diffusa.
Galeopsis Ladanum.
Tetrahit.
Galeobdolon luteum.
Teucrium campanulatum!
Plectranthus fruticosus.
Cleonia lusitanica.
Dracocephalum austriacum.
Phlomis fruticosa!
Vitex incisa.
Aristolochia, sp.!
Ophrys aranifera!
Orchis simia.
pyramidalis!
latifolia!
morio!
papilionacea.
mascula.
latiflora.
conopsea.
Habenaria bifolia.
Corallorhiza innata.
Aceras anthropophora.
Cattleya Moasiae!
Phalaenopsis equestris!
Pogonia ophioglossoides!

The literature of peloria is very extensive. The following are the
principal papers, not already mentioned, which relate to the subject,
arranged under the genera, placing those first which are most subject to
this anomaly (see also Regular Peloria).

_Linaria_.--Adanson, 'Fam. Plant.,' t. i, p. 110. Jussien,
'Gen. Plant.,' p. 120. Poiret, 'Encycl. Method, Suppl.,' t.
iii, Jaeger, 'Missbilld. der Gewachs.,' pp. 94, 97, a