Difference between revisions of "Cycas desolata"

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closely allied species, resulting in a unique taxonomic
 
closely allied species, resulting in a unique taxonomic
 
status for the ''Cycas'' was named
 
status for the ''Cycas'' was named
''Cycas desolata'' P.I. Forst. Differences between the
+
''Cycas desolata'' P.I. Forst.  
species, tabulated by Forster (''op cit''.), are reproduced in
+
 
Table 1.
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[[File:Cycas_491502.jpg|left|frame|Figure 2. ''Cycas desolata'' male Cone.]]
 +
<!--Differences between the species, tabulated by Forster (''op cit''.), are reproduced in Table 1.-->
  
 
Forster (1995) reports ''C. desolata''
 
Forster (1995) reports ''C. desolata''
 
"... unique in Australian species of ''Cycas'' with
 
"... unique in Australian species of ''Cycas'' with
 
respect to the blue foliage, fronds without basal spines on
 
respect to the blue foliage, fronds without basal spines on
the petiole, leaflet margins recurved, leaflet base gradually
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the petiole, leaflet margins re-curved, leaflet base gradually
 
narrowing proximally, leaflets straight and relatively long
 
narrowing proximally, leaflets straight and relatively long
 
(180-210 x 3.8- 5 mm) and the small broadly triangular
 
(180-210 x 3.8- 5 mm) and the small broadly triangular
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type locality is cited as "...exceeding 7 m in height...".
 
type locality is cited as "...exceeding 7 m in height...".
  
[[File:Cycas_491502.jpg|left|frame|Figure 2. ''Cycas desolata'' male Cone.]]
 
 
[[File:Cycas_491503.jpg|left|frame|Figure 3. ''Cycas desolata'' megasporphylls.]]
 
[[File:Cycas_491503.jpg|left|frame|Figure 3. ''Cycas desolata'' megasporphylls.]]
  

Revision as of 03:10, 7 March 2019


Welcome to the PACSOA Palms and Cycads wiki !

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File:Cycas 491505.jpg
Figure 1. Cycas desolata - The tallest plant seen.

In late 1993 a population of Cycas, from an area north-west of Charters Towers, was reported by R. Fensham (Queensland Herbarium) and its fronds keyed to C. cairnsiana according to Hill's (1992) key. As no C. cairnsiana was known for this locality it became the subject of some interest. An investigation in early 1994 showed it to have several distinct differences from C. cairnsiana and also C. platyphylla, a closely allied species, resulting in a unique taxonomic status for the Cycas was named Cycas desolata P.I. Forst.

Figure 2. Cycas desolata male Cone.

Forster (1995) reports C. desolata "... unique in Australian species of Cycas with respect to the blue foliage, fronds without basal spines on the petiole, leaflet margins re-curved, leaflet base gradually narrowing proximally, leaflets straight and relatively long (180-210 x 3.8- 5 mm) and the small broadly triangular megasporophyll lamina." He further adds, "C. desolata is a striking cycad because of the blue coloration of the foliage and the large size of some individuals." One plant at the type locality is cited as "...exceeding 7 m in height...".

Figure 3. Cycas desolata megasporphylls.

C. desolata is known from at least two plant populations that occurs over an area of about 40 km in eucalypt woodland on shallow skeletal soils or low rocky outcrops and is a relatively common plant in its habitat. The specific epithet given in the naming of the species desolata refers "...to the ruinous or desolate nature of the habitat where this plant occurs. "

Figure 4. Cycas desolata habitat.

Contents

Acknowledgments:

Extracts reproduced with permission of the Editor from: Forster, P.I. (1995). Forster, P.I. (1995). Cycas desolata (Cycadaceae), a new species from north Queensland. Austrobaileya 4(3):345-352.

References:

Hill, K.D. (1992). A preliminary account of Cycas (Cycadaceae) in Queensland. Telopea 5:177-206

Contributed by:

Tom Turner (text)
Paul I. Forster (photographs)
Reproduced from Palms & Cycads, No. 49 Oct-Dec 1995


External Links:

Cycad Pages, IUCN, JSTOR, Trebrown

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