Chrysanthemum plant named Yellow Dynamo

A Chrysanthemum plant named Yellow Dynamo having strong stems with long peduncles that carry bright, deep yellow flowers; nine week response; excellent production per stem; good shipping and keeping qualities, and adaptability to year around programs.

The present invention comprises a new and distinct cultivar of 
Chrysanthemum morifolium, Ramat., hereinafter referred to by the cultivar 
name Yellow Dynamo. 
Yellow Dynamo is a mutation from Dynamo, disclosed in a pending application 
of Leonard H. Shoesmith. Yellow Dynamo was originated in a mutation 
breeding program, the primary purpose of which was to expand the color 
(white) of Dynamo. The program was conducted by or under the supervision 
of applicant in 1981 in Parrish, Fla. Tissue cultured plants of the parent 
cultivar Dynamo were exposed to 2,000 rads of X-ray energy. Yellow Dynamo 
was discovered and selected from a bed of irradiated parent plants on June 
4, 1981 by applicant in a controlled environment in Parrish, Fla. 
The first act of asexual reproduction of Yellow Dynamo was accomplished 
when vegetative cuttings were taken from the initial selection in August 
of 1981 in a controlled environment in Parrish, Fla. by a technician 
working under formulations established and supervised by applicant. 
Horticultural examination of selected units initiated in November of 1981 
has demonstrated that the combination of characteristics as herein 
disclosed for Yellow Dynamo are firmly fixed and are retained through 
successive generations of asexual reproduction. 
Yellow Dynamo has not been observed under all possible environmental 
conditions. The phenotype may vary significantly with variations in 
environment such as temperature, light intensity, and day length. The 
following observations, measurements and comparisons describe plants grown 
in Parrish, Fla. under greenhouse conditions which approximate those 
generally used in commercial practice. 
The following traits have been repeatedly observed and are determined to be 
basic characteristics of Yellow Dynamo, which in combination distinguish 
this Chrysanthemum as a new and distinct cultivar: 
1. Nine week response. 
2. Strong stems with long peduncles up to 30 cm long. 
3. Excellent production per stem; up to 14 good usable fully double flowers 
per stem. 
4. Bright, deep yellow florets, immature florets a light yellow-green; 
about 300 florets per capitulum. 
5. Florets slightly incurved, up to 35 mm long, and are oblong to 
elliptical with an entire margin and an obtuse tip. 
6. Thick capitulum up to 70 mm across. 
7. The ability to ship and keep well. 
8. Adaptability for cultivation in year around programs. 
Of the cultivars known to applicant, the most similar in comparison is the 
parent cultivar Dynamo from which it is distinguished by its bright, deep 
yellow flowers. The flowers of Dynamo are white. Yellow Dynamo can also be 
compared to Yellow Polaris, differing therefrom by its thicker capitulum, 
larger leaves, and better performance under low light conditions. The 
flower color and general habit of Yellow Dynamo and Yellow Polaris are 
similar.

In the following description, color references are made to The Royal 
Horticultural Colour Chart. The color values were determined at 
approximately 9:00 a.m. on July 2, 1986 under 4000 foot candles of light 
intensity at Parrish, Fla. 
Classification: 
Botanical.--Chrysanthemum morifolium, Ramat., cv Yellow Dynamo. 
Commercial.--Cut cushion spray or cushion pompon. 
INFLORESCENCE 
A. Capitulum: 
Form.--Flat. 
Type.--Fully double. 
Diameter across face.--70 mm. 
B. Corolla of ray florets: 
Color (general tonality from a distance of three meters).--Yellow. 
Color (upper surface).--12A. 
Color (under surface).--12B. 
C. Corolla of disc florets: None. 
D. Reproductive organs: 
Androecium.--None. 
Gynoecium.--Present in all florets. 
PLANT 
A. General appearance: 
Height.--1-2 meters at finish. 
B. Foliage: 
Color (upper surface).--147A. 
Color (under surface).--147B. 
Shape.--Deeply lobed and slightly serrated.