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"Bunched" or "Molar" R: "bunched-tongue" alveolar approximant  (occurs in Southern American English and some Midwestern and Western American English most strongly); in fact, there is often a continuum of possible realizations for the postalveolar approximant within any single dialect from a more apical articulation to this more bunched articulation
In most dialects /r/ is labialized in many positions, as in reed[i:d] and tree[ti:]; in the latter case, the /t/ may be slightly labialized as well. In General American, it is labialized at the beginning of a word but not at the end.
In many dialects, /r/ in the cluster /dr/, as in dream, is realized as a postalveolar fricative or less commonly alveolar. In /tr/, as in tree, it is a voiceless postalveolar fricative[?] or less commonly alveolar. In England, while the approximant has become the most common realization, /r/ may still be pronounced as a voiceless tap after /?/ (as in thread). Tap realization of /r/ after /?/ is also reported in some parts of the United States, particularly Utah.
There are two primary articulations of the approximant /r/: apical (with the tip of the tongue approaching the alveolar ridge or even curled back slightly) and domal (with a centralized bunching of the tongue known as molar r or sometimes bunched r or braced r ). Peter Ladefoged wrote: "Many BBC English speakers have the tip of the tongue raised towards the roof of the mouth in the general location of the alveolar ridge, but many American English speakers simply bunch the body of the tongue up so that it is hard to say where the articulation is". The extension to the IPA recommends the use of the IPA diacritics for "apical" and "centralized", as in ⟨, ⟩, to distinguish apical and domal articulations in transcription. However, this distinction has little or no perceptual consequence, and may vary idiosyncratically between individuals.
Rhoticity and non-rhoticity
English accents around the world are frequently characterized as either rhotic or non-rhotic. Most accents in England, Wales, Australia, New Zealand, and South Africa speak non-rhotic accents, and in those English dialects, the historical English phoneme /r/ is not pronounced except before a vowel.
On the other hand, the historical /r/ is pronounced in all contexts in rhotic accents, which are spoken in most of Scotland, Ireland, the United States, Canada, and in some English accents (like in the West Country and some parts of Lancashire and the far north). Thus, a rhotic accent pronounces marker as ['m?rk?r], and a non-rhotic accent pronounces the same word as ['m?:k?]. In rhotic accents, when /r/ is not followed by a vowel phoneme, it generally surfaces as r-coloring of the preceding vowel or its coda: nurse[n?s], butter['b?t?].
R-labialization, which should not be confused with the rounding of initial /r/ described above, is a process occurring in certain dialects of English, particularly some varieties of Cockney, in which the /r/ phoneme is realized as a labiodental approximant[?], in contrast to an alveolar approximant[?].