A revision of the genus Neolloydia B. &amp; R. (Cactaceae)

Anderson, Edward F.

doi:10.25223/brad.n4.1986.a1

Cited by 17 publications

(24 citation statements)

References 8 publications

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“…All the plants have been raised from documented seeds purchased from local nurseries or obtained from the Turbinicarpus Gruppe Association (Table 1). The plants, cultivated in xeric conditions, exhibited a shoot and spine morphology matching that given in the original descriptions as well as the features described in the current literature (Anderson, 1986;Lüthy, 2001;Donati and Zanovello, 2004). This suggests that no modifi cations occurred in spine anatomy.…”

Section: Methodssupporting

confidence: 74%

“…Weber ex Britton et Rose and Pediocactus Britton et Rose (Butterworth et al, 2002). The taxonomy of Turbinicarpus remains the object of continuous changes that are refl ected at a nomenclatural level in the large number of names which is available today to classify the known taxa (Anderson, 1986;Lüthy, 2002;Donati et Zanovello, 2004;Hunt, 2006). In this genus the spines show an incredible variation in size, number, shape, and texture and are commonly described as acicular, bristly, spongy, corky, papery or plumose, being a key feature for its taxonomy (Anderson, 1986;Lüthy, 2002).…”

Section: Introductionmentioning

confidence: 99%

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Micromorfología y anatomía de las espinas de Turbinicarpus (Cactaceae)

Mosco¹

2009

Rev.Mex.Biodiv.

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Spines are a striking feature of cacti and display wide variation in size, number, shape, and texture. This study showed that Turbinicarpus species exhibit not only a high variability in the gross morphology of the spines, but also in their micro-morphology. Their surface can be smooth or ornamented with projections that can be low, conical, pinnate, or long trichomes. The epidermis can be continuous, broken up into single cell elements or transversely fi ssured, the fi ssures extending deeply into the underlying sclerenchyma. The mechanical properties of the spines are related to their anatomy, here documented for the fi rst time. The woody rigid spines being made up of fi bers with thick walls (> 3 μm), while papery or corky spines have a sclerenchyma made up of fi bers with thin walls (< 2 μm). Alternatively, spine anatomy can be dimorphic with the outermost layers made up of thin-walled fi bers and an inner core made up of thick-walled fi bers. Turbinicarpus taxonomy mostly relies on spine features and the newly collected data can contribute to a better understanding of the interspecifi c relationships. The epidermal features like long trichomes or the lack of ornamentation as well as the modifi ed anatomy of corky spines may be apomorphic characters within the genus.

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Section: Methodssupporting

confidence: 74%

Section: Introductionmentioning

confidence: 99%

Micromorfología y anatomía de las espinas de Turbinicarpus (Cactaceae)

Mosco¹

2009

Rev.Mex.Biodiv.

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“…Subfamily Opuntioideae of the Cactaceae contains 220-350 species of stem succulents native to the Western Hemisphere (Britton and Rose 1919;Barthlott and Hunt 1993;Anderson 2001). Opuntioideae is one of three traditionally recognized subfamilial groups (Cactoideae, Opuntioideae, and Pereskioideae; Cereae, Pereskieae, and Opuntieae sensu Britton and Rose 1919).…”

Section: Introductionmentioning

confidence: 99%

Phylogeny of Opuntioideae (Cactaceae)

Griffith¹,

Porter²

2009

International Journal of Plant Sciences

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Opuntioideae are a diverse subfamily of Cactaceae with significant diversity of form and habitat and wide distribution throughout the New World. Nuclear ribosomal ITS and chloroplast trnL-trnF region DNA sequence-based phylogenetic analysis of Opuntioideae derived from Bayesian methods is presented. This analysis supports the following relationships: Opuntioideae are monophyletic; the subfamily is made up of four major lineages (Maihueniopsis-like species, Pterocactus, other terete-stemmed species, and flat-stemmed species). The two deepest lineages (including most species of Maihueniopsis and all Pterocactus) are marked by diminutive, succulent, often geophytic habit and are leafless at maturity. These analyses suggest that Opuntioideae have geographic origin in west-central South America. Generic circumscription is considered in the context of the recovered relationships. Maihueniopsis is recovered in multiple lineages. Many currently accepted genera may be para-or polyphyletic.

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“…The Pereskia-as-primitive hypothesis is supported by other evolutionary considerations. One often-proposed mechanism for evolution in Cactaceae that is a natural corollary of the Pereskia-as-primitive idea is paedomorphic reduction or neotony (Boke, 1944;Buxbaum, 1956;Anderson, 1986). If the first cacti were leafy trees or shrubs, many extant cacti would be considered reduced forms.…”

Section: Early Hypotheses On Cactus Evolutionmentioning

confidence: 99%

What did the first cactus look like? An attempt to reconcile the morphological and molecular evidence

Griffith

2004

TAXON

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A revision of the genus Neolloydia B. & R. (Cactaceae)

Cited by 17 publications

References 8 publications

Micromorfología y anatomía de las espinas de Turbinicarpus (Cactaceae)

Micromorfología y anatomía de las espinas de Turbinicarpus (Cactaceae)

Phylogeny of Opuntioideae (Cactaceae)

What did the first cactus look like? An attempt to reconcile the morphological and molecular evidence

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