CHEIRANTHUS MAESHALLII. 
Nat. Ordc>\ Cruciferje. 
Generic Chauacter.— Cheii'antlms, B\:— Calyx of four con- 
nivent sepals, the two lateral saccate at the base. Corolla of 
four petals, hypoj^'nous, clawed, with a spreading obovate or 
eraarginate limb. Stamens six, hypogj'nous, tetradynamous, 
not toothed. Stigma deeply two-lobed, the lobes recurved. 
Sitiqua two-valved, four-sided, or bilaterally compressed, valves 
one-nerved; placentas obtuse on the back; replum without 
nerves. Seeds numerous, in one row, pendulous, ovate, com- 
pressed, imniarginate or margined ; funieuU iiliforra, free. Ex- 
albuminous embryo, with Hat cotyledons accumbent on the 
ascending radicle. {Endlkh. Gen. Plant, 1818.) 
Cheirajjthus MARsnALLii, Marshall's Cheirantlms, — Hybrid, 
between Cheiranthus ochroleucus and Erysimum Peroffskia- 
num? 
If^ESCRIPTION. — A half-slirubby herb, one foot to eighteen inclies liigb, with erect angular 
^ branches, clothed, like the leaves, with appressed forked hairs. Leaves crowded at the 
lower part of the stems, more distant upwards and on the flowering stems ; upper leaves 
narrowly lanceolate and acute, with a few teeth ; the lower leaves attenuated dowiawards into 
a long, narrowly winged, stalk-Uke base, and becoming more or less spathulate. Inflorescence 
at first corymbose, elongating into a raceme. Calyx of four erect sepals, the two lateral 
deeply saccate at the base. The four petals with a somewhat orbiculate spreading limb, 
suddenly attenuated into a long, narrow claw, deep clear orange at first, becoming rather paler, 
scented (the odom- resembling a combinaton of those of the Violet and Primrose). Stamens 
tetradynamous, with a bifid gland between each pair of long stamens. Siliqua fom--sided ; 
stigma two-lobed. Seeds with accumbent cotyledons. 
The subject of our plate is a very interesting and remarkable plant, said to be a hybrid between 
Cheiranthus ochroleucus and Erysimum Perofiskianum ; and it does undoubtedly exhibit a com- 
bination of the characters of the two plants. In the form of the envelopes of the flower, and in the 
forked glands which appear to represent abortive stamens completing the circle of foiu' with the 
two shorter ones, it agrees much more closely with Erysimum than with Cheiranthus ; but 
in the seeds we find the peculiar character which belongs to the Cheiranthus as one of 
the Pleui'orhizoiis tribe, — that the radicle is applied against the edges or sides of the 
cotyledons, while in Erysimum the radicle is folded on to the back of one of the cotyledons. 
This, therefore, appears to be a very remarkable case of hybridation, occurring not merely 
between plants of difierent genera, which is already exceptional to the ordinary rule, but 
between genera in which there is a most imjjortant difference in the seeds. It deserves 
carefid investigation; and the further history of the ripe seeds (which we have not had an 
opportunity of examining) should be carefully observed. — A. H. 
History &c. — This very beautiful plant was raised by Mr. John Marshall of Limburn. 
It was obtained as we are informed, by fertilizing the dwarf primrose-coloiired Cheiranthus 
ochroleucus, with the deep orange Erysimum Perofiskianum ; and, in appearance, is exactly 
intermediate between these very distinct looking jjlants. Mr. Marshall " was led to cross the 
Cheiranthus ochroleucus, in consequence of the difficulty of getting seeds from it ; the few seeds 
which resulted from this fertilization were sown in the open border in 1846, and the plants 
first bloomed in 1847," one of them proving to be the variety now figured. From the same 
batch of seeds, three other varieties were obtained, one like ochroleucus, and the others with 
orange-coloured fiowers. One of these orange-flowered sorts was lost ; the other which is 
much like Marshallii, grows eighteen inches high, but neither the truss nor the flowers are so 
large as in that variety. Mr. Marshall has also bloomed four plants raised fi'om Marshallii, 
aU slightly difierent in colom-, height, and foliage, but inferior to their parent. At Limbvu-n the 
plant flowers about the latter end of May, in the open air. The .stock of this charming variety 
is now in the possession of Mr. R. M. Stark, of the Edgehill Nm-sery, Edinbm-gh, and our 
di-awing was made from a jilant commimicated by Mr. Stark, early in May of the present year. 
The fresh flowers are very agreeably -violet scented, blended with a little of the fragrance of 
the primrose. 
CuLTTJEE. — Like its parent — the Cheiranthus ochroleucus, this hybrid, should be annually 
renewed by propagation. For this pui-pose cuttings should be taken as soon as the young 
shoots are produced after flowering, and these should be planted in light sandy soU, under 
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