CONVOLVULACEAE
Convolvulus acanthocladus Boiss. Common. Above c.500 m (lower in northernmost Ru'us al-Jibal, near Khasab). Increasingly common above c.800 m and co-dominant above c.1100 m as cushions within "steppe" vegetation, to summits at 2000 m. In Hajar Mtns, found at 900-1000 m on ridge of Jebel Qitab, SW of Fujeirah (where wild olive trees are also present) but otherwise absent to S for c.130 km. Re-appears in Mahdhah area of N. Oman, where present occasionally along ophiolite mountain front and foothills at c.600-800 m, continuing southwards to Ibri area. Tomentose growth form of Ru'us al-Jibal plants is distinct from more rectilinear growth form in foothills of N. Oman (see Section 14). Present but very rare in Jebel Akhdar (Ghazanfar 1992a) and J. Kawr, where growth form is tomentose. Common at summit of Jebel Aswad in Eastern Hajar Mtns, SE of Muscat, c.430 km from Ru'us al-Jibal (Mandaville 1977). Single specimen recorded by the author at Selma Plateau (c.1800 m) in the Jebel Bani Jaber range to the E of Jebel Aswad. Fig. 5.4.6. See also Figs. 3.1.1, 3.1.4, 3.1.5, 3.1.8, 3.1.9, 3.1.11, 3.1.13, 3.1.15, 3.1.16, 3.1.17, 3.1.21, 3.1.23 and 3.3.1 and compare Fig. 5.5.4.
Convolvulus ulicinus Boiss.* Occasional. c.500-1900 m+, esp. on bedrock slopes. ID by L. Boulos. Also rare in Jebel Akhdar.
Convolvulus virgatus Boiss. Rare. Scattered locations in Ru'us al-Jibal, up to c.1200 m. Grazing probably a factor since occasional large, healthy plants found at inaccessible cliff sites. Common in Hajar Mtns.
Cuscuta planifora Ten. Locally common after rains. Up to at least 1600 m. Various hosts, including annuals (e.g., Asphodelus tenuifolius).
CRASSULACEAE
Crassula alata (Viv.) Berger subsp. alata* [Jongbloed (2003)] Rare. Low elevation. Recorded by Boer & Chaudhary from UAE, Wadi Bih, and by Mandaville from Wadi Khasab, 100 m.
Rosularia adenotricha (Wall ex Edgw.) Jansson subsp. adenotricha* ** Rare. Single locality in southern Ru'us al-Jibal, but probably overlooked elsewhere. On silt and organic debris in shaded vertical clefts or hollows in cliffs at 1200-1300 m. Leaves sometimes form a prostrate mat easily mistaken for the common mountain liverwort Plagiochasma rupestre. ID by L. Boulos. Fig. 5.1.14.
Sedum hispanicum L.* Locally common. Up to at least 1200 m. Also recorded from northernmost Hajar Mtns. See Fig. 3.3.6.
Umbilicus botryoides Hochst. ex A. Rich* [Mandaville (1985)] Recorded by Mandaville at J. Harim, 1850 m, in shade of boulders. [Note: It is probable that the two Umbilicus spp. recorded from the Ru'us al-Jibal are the same, and they have been so treated (as U. horizontalis) in compiling the statistics presented in the accompanying paper. Jongbloed (2003) does not mention U. botryoides and Boulos (1999) considers it to be an Afro-tropical species.]
Umbilicus horizontalis (Guss.) DC.* Locally common in silt in damp, shaded cracks or under rock overhangs from c.500 m to at least 1750 m. ID by L. Boulos. Recorded from Masafi, less than 35 km S of the Ru'us al-Jibal, but otherwise very rare or absent in the Hajar Mtns to the south. [See note under U. botryoides.]...