Vientiane prov., Kasi distr., between San and Tham Tai villages, around point 19°17'47.9''N 102°08'58.9''E. Secondary broad-leaved evergreen dry forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 900-1000 m a.s.l. Treelet 4-5 m tall on steep shady stream slope. Not rare.
Luang Prabang prov., Pon Xay distr., along the way to Bane Phou Souong village, Pha Hiua Bin Toc Mountain, around point 19°57'37.0''N 102°25'03.0''E. Degraded primary evergreen and semideciduous forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 600-850 m a.s.l. Treelet 3-5 m tall on shady rocky slope. Fruits green. Common.
Luang Prabang prov., Ngoy distr., Don Khun village, near waterfall, around point 20°31'36.9''N 102°35'15.8''E. Remnants of primary evergreen forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 450-550 m a.s.l. along mountain stream. Treelet 3-5 m tall on shady rocky stream slope. Not rare.
Luang Prabang prov., Ngoy distr., Don Khun village, near waterfall, around point 20°31'36.9''N 102°35'15.8''E. Remnants of primary evergreen forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 450-550 m a.s.l. along mountain stream. Treelet 3-5 m tall on shady rocky stream slope. Not rare.
Vientiane prov., Kasi distr., between Pa Chao and Nam Ken villages, Pa Chao Mt., around point 19°19'50.6''N 102°21'20.5''E.
Secondary broad-leaved evergreen dry forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 1000-1100 m a.s.l. Unbranched treelet 5-6 m tall on steep rocky slope. Not rare.
Vientiane prov., Vang Vieng distr., Patang village, around point 19°04'15.6''N 102°24'33.2''E. Secondary broad-leaved semi-deciduous dry forest on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. about 670 m a.s.l. Treelet 3-4 m tall. Flowers reddish. Common.
Son La Prov., Moc Chau Distr., Chieng Son comm., Pha Luong village, Pha Luong Mountain (elevation from Pha Luong village at 930 m to Mt. peak at 1860 m a.s.l.). Open secondary scrub after fire on flat sandy Pha Luong summit composed with eroded red-brown sandstone at elevation 1800-1850 m a.s.l. around point 20°40’23.0N 104°37’52.0E. Treelet 5-7 m tall in open rocky place. Flowers yellowish. Not common.
Son La Prov., Van Ho Distr., Van Ho comm., Hua Tat village, around point 20°46’21.7N 104°47’47.5E. Remnants of primary evergreen broad-leaved and mixed forest (with Pinus wangii) on very steep rocky slopes and on mountain tops composed with highly eroded karstic light gray marble-like limestone at elevation 1300-1350 m a.s.l. Treelet 4-5 m tall on exposed rocks on mountain top. Flowers light greenish. Not common.
Vientiane Prov., Vang Vieng Distr., Na Po village, about 12 km to the W of Vang Vieng town, Pa Nang Oua Mt., around point 18°55’44.9”N 102°20’20.1”E. Dry broad-leaved primary and secondary evergreen and semideciduous forest on very steep rocky slopes and on vertical cliffs of remnant highly eroded rocky limestone mountains composed by solid crystalline limestone at elevation 700-1000 m. Treelet on rocky slope near mountain top. Fruits dark wine-purple to almost black. Occasional.
Son La Prov., Van Ho Distr., Tan Xuan Municipality, Cot Moc village, territory of Xuan Nha natural reserve, eastern slopes of Pha Luong Mountain. Remnants of primary and secondary broad-leaved evergreen humid forest on very steep mountain slopes composed by shale and sandstone at elevation about 900-1450 m a.s.l. around point 20°40’33.3’’N 104°39’00.3’’E.
Treelet 2 m tall on very steep slope along ridge edge. Rare.
Vientiane Prov., Vang Vieng Distr., Phol Xai village, about 8 km to the W of Vang Vieng town, Phar Poon Mt., around point 18°56’11.5”N 102°20’05.0”E. Dry broad-leaved primary and secondary evergreen forest on very steep rocky slopes and on vertical cliffs of remnant highly eroded rocky limestone mountains composed by solid crystalline limestone at elevation 300-900 m. Treelet 5 m tall on rocky tops of mountain at elevation 800-900 m. Fruits light glossy green. Not common.
Son La Prov., Moc Chau Distr., Chieng Son comm., about 1 km to NE from Chieng Son Village, around point 20°46’02.0N 104°37’03.1E. Remnants of primary broad-leaved evergreen forest on tops of hills composed with karstic highly eroded yellow-white limestone at elevation 1150-1250 m a.s.l. Treelet 3-4 m tall on exposed mossy rocks on mountain top. Fruits dark green. Not common.
Cao Bang Prov., Bao Lac Distr., Hong An municipality, Lung Pan village. Open secondary scrub and grasslands on steep alluvial slope of limestone hill along road at elevation about 1050 m a.s.l. around point 22°48’50.5’’N 105°46’28.0’’E.
Dwarf treelet 1.5 2.5 m tall among secondary shrubs. Flowers white to light yellowish. Rare.
Cao Bang Prov., Bao Lac Distr., Hong An municipality, Lung Pan village. Open secondary scrub and grasslands on steep alluvial slope of limestone hill along road at elevation about 1050 m a.s.l. around point 22°48’50.5’’N 105°46’28.0’’E.
Dwarf treelet 1.5 2.5 m tall among secondary shrubs. Flowers white to light yellowish. Rare.
Houphan Prov., Hem Distr., Khon Ngua village, around point 19°55'53.2''N 103°16'24.2''E. Secondary broad-leaved evergreen open dry forest with bamboo on very steep rocky mountain slopes composed by solid marble like highly eroded limestone at elev. 700-950 m a.s.l. Tree 5-7 m tall on steep shady slope. Common.
Cao Bang Prov., Bao Lac Distr., Hong An municipality, Mi Lung village. Primary broad-leaved and mixed humid evergreen forest (with Podocarpus, Pinus, Fokienia and Tsuga) on very steep slopes and along rocky ridge composed with solid crystalline highly eroded limestone at elevation about 1500-1550 m a.s.l. around point 22°49’15.4’’N 105°49’53’’E.
Treelet 2-3 m tall in rather open place on rocky mountain slopes. Flowers yellowish. Not rare.
Hoa Binh Prov., Lac Son Distr., Ngoc Son Municipality, Khu village, around point 20°26’32”N 105°19’32”E. Primary broadleaved forest on steep rocky slopes of remnant mountain composed with solid crystalline highly eroded limestone at elevation about 550-650 m a.s.l. Tree to 5 m tall in wet valley between ridge tops. Not ripe fruits green. Not rare.
Xiangkhouang Prov., Peak Distr., Oran village, around point 19°38’53”N 103°23’12”E. Primary and secondary broad-leaved evergreen dry forest on shale sandstone slopes and along ridge edge at elev. about 1750-1850 m a.s.l.
Creeping epiphytic vine 10-20 m long on tall mossy tree. Occasional.
Houphan Prov., Viengxay Distr., Vieng Xai village, around point 20°23'41.3''N 104°13'44.5''E. Primary and secondary broad-leaved evergreen dry forest on very steep rocky slopes of highly eroded mountains composed by solid marble-like limestone at elev. 800-950 m a.s.l. Epiphyte shrub about 2 m tall on old tree. Fruits orange to almost red. Common.
Cao Bang Prov., Bao Lac Distr., Hong An municipality, Lung Pan village. Open secondary scrub and grasslands on steep alluvial slope of limestone hill along road at elevation about 1050 m a.s.l. around point 22°48’50.5’’N 105°46’28.0’’E.
Dwarf treelet 1.5 2.5 m tall among secondary shrubs. Flowers white to light yellowish. Rare.