THE REV. G. HENSLOW ON THE ORIGIN OF FLORAL ASTIVATIONS. 189 
In Lamium album, as illustrated by ‘Sachs’s Text Book, р. 480, although 3 sepals 
appear before the other two, yet the adult calyx is scarcely irregular. On the other 
hand, the 5 petals appear together as equal-sized рарШзе ; the two posterior soon far out- 
strip the others, then arching over them protect the anthers even from a very young 
condition. Тһе anterior petal in the adult stage is two-lobed, and might give rise to 
the impression that the lip was composed of two parts, whereas the history of its deve- 
lopment reveals the fact that it is really single, while the “hood” is double. This is 
also corroborated by the fact that two vascular bundles run side by side between the two 
posterior and shorter stamens. Іп Ajuga reptans a converse process takes place, in 
that the posterior pair of petals soon become arrested, and the lip now grows rapidly, 
arches over, and protects the andreecium just as the hood does in Lamium. 
VIII. VARIETIES OF ÆSTIVATION IN THE SAME SPECIES OF DIFFERENT GENERA 
RESPECTIVELY. 
RANUNCULUS BULBOSUS, or Bulbous Ranunculus. 
Quincuncial to the right. Occurred about 22 p. c. 
5 2 „ lef Pa 5 "3975 
Half-imbricate » right $ h 6, 
j % » left 5 5 8 us 
Imbricate proper ,, right > ЧӘ а 
is $ » Де »* wc M 
Convolute  ,, » right э $ G 
а » у Те н » Jg 
Anomalous :—Corollas having 6, 7, or 8 petals variously folded, but with a general 
tendency to be convolute; also a few with 5 petals, but abnormally imbricated. 
VIBURNUM TINUS, or Laurustinus. On a corymb, with 125 flower-buds. 
Quincuncial to the right. Occurred about 23 p. c. 
5 3 „ IBR 55 н Z4 y 
Half-imbrieate — ,, right Ж DO ETT 
j ^ „ left 2A XS 
Imbricate proper , right » н 
J is о ӨР s in. бт 
Anomalous :—Corollas with 6 petals, three instances ; with 4 petals, one instance. 
PRIMULA VULGARIS, or Primrose. Of 120 flower-buds examined. 
Quincuncial to the right. Occurred about 22 p. c. 
33 ” E left РИ 2 27 3 
Half-imbricate  , right . . . . . 4 examples. 
is $5 2 mE iuro s 
Imbricate proper ,, right М i 5 p. c. 
left m ” 6 ” 
LE] 29 3 
