Optei por colocar aqui esta informação que encontrei no CPUK. Já durante algum tempo esta definição estava a lixar-me os neurónios porque estava a tentar perceber como se devia separa a binata, a dichotoma e a multifida. Felizmente deparei-me com esta resposta no CPUK e vou colocá-la aqui.
Esta resposta foi colocada pelo Sean Spence neste tópico: http://www.cpukforum.com/forum/index.php?showtopic=2332
Esta resposta foi colocada pelo Sean Spence neste tópico: http://www.cpukforum.com/forum/index.php?showtopic=2332
The different varieties of Drosera binata are basically separated from one another by the number of forks and points on the leaves. Names such as D. multifida and D. dichotoma are not legitimate ones and are used by some growers only for convenience. Possibly some time in the future these plants may be separated into species of their own by a taxonomist, but until then they should be referred to as varieties of D. binata only.
D. binata 'T Form'- is the typical form of D. binata that only forks once. This form is the most common and found along the east coast and south of Australia across to WA and New Zealand. Usually a dark green plant with red glands.
D. binata var. dichotoma 'Small Type' - This form forks twice to form 4 points. This variety is generally a warmer growing plant than the typical variety and is found growing up the east coast of Australia only. These plants grow to a similar size as the typical 'T form' which is usually around 20cms tall.
D. binata var, dichotoma 'Giant Type'- Is the much larger version of the previous form (up to 60 cms) which has a golden green colouration. This plant also only occurs on the east coast of Australia from about Sydney northwards.
D. binata var. dichotoma 'T-form'- Is a plant that is about the same size as a giant dichotoma with the same golden green colouration but with only one fork and two points. Also an east coast plant.
D. binata var. multifida- In multifida the leaves fork again, this time to produce 8 points (generally, there are always exceptions). These plants are also only found on the east coast of Australia and also begin at about Sydney.
D. binata var. multifida 'Extrema'- Even more forking in this variety can produce an amazing amount of points. I think sometimes up to 64 points per leaf (possibly more). This plant occurs in a sub-tropical climate on the northern half of eastern Australia in the state of Queensland.
D. binata var. multifida 'Pink Form'- Same as the var. multifida but with pink flowers.
An interesting point is that I have seen populations of plants which often show variety. In a population of the typical D. binata in southern Australia (the state of Victoria near Melbourne) you can sometimes find plants (usually only a couple per population) that fork more than once and others that fork only once but are much larger with the same golden green colouration of a giant dichotoma. These populations have been seen in areas many hundreds of kms from where the var. dichotoma varieties are found. These plants are probably not what you would call a var. dichotoma, just an aberrant form that has mutated amongst a large population.
Hope this helps.
Sean.