Diameter about equal to the height; shell generally almost globose, consisting mostly of the body whorl (umbilicus either conspicuously open or covered by an obvious callus; height of some species attaining 10 cm).
There are approximately 8 species and subspecies in this genus: U. alacris · U. barrierensis · U. denticulifera · U. niyatensis · U. pseudovitreus · U. pukeuriensis · U. vitrea · U. zelandica
There are approximately 607 species, subspecies, varieties, forms, and cultivars in this genus. Here are just 100 of them: P. ellipticum serpentinum · P. ferrugineum laxiflorum · P. ferrugineum linifolium · P. rubiginosum rubiginosum · P. rubiginosum wingii · P. senacia reticulatum · P. undulatum emmettii · P. 'Arundel Green' · P. 'Bicton Silver' · P. 'Craxten' · P. 'Crinkles' · P. 'Dark Delight' · P. 'Emerald Lake' · P. 'Essex' · P. 'Garnettii' · P. 'Green Flame' · P. 'Holbrook' · P. 'Humpty Dumpty' · P. 'Margaret Turnbull' · P. 'Mystery' · P. 'Nanum Variegatum' · P. 'Oliver Twist' · P. 'Peter Pan' · P. 'Purple Princess' · P. 'Saundersii' · P. 'Stephens Island' (Pittosporum) · P. abyssinicum · P. acacioides · P. acuminatissimum · P. adaphnephylloides · P. adaphniphylloides · P. aff. buchananii · P. aliferum · P. ambrense · P. anamallayense · P. andersonii · P. aneityense · P. angustifolium · P. angustifolium ligustifolium · P. angustilimbum · P. anomalum · P. anomalum 'Falcon' · P. anomalum 'Kestral' · P. anomalum 'Raven' · P. anomalum 'Starling' · P. antunesii · P. arborescens · P. arbutifolium · P. argentifolium (Hawai'i Poisonberry Tree) · P. argyrophyllum · P. artense · P. baileyanum · P. balansae · P. balfourii · P. batavorum · P. baudoinii · P. baudouinii · P. beecheyi · P. berberidoides · P. berberioides · P. bernardii · P. bicarpellatum · P. bicolor (Cheesewood) · P. bicolor 'Cradle' · P. bicolor 'Mount Field' · P. bicrurium · P. boninense · P. bouletii · P. bracheolatum · P. brachyandrum · P. brachysepalum · P. brackenridgei · P. bracteolatum · P. brassii · P. brevicalyx · P. brevispinum · P. brevistylum · P. buchanani · P. buchananii · P. bullato-ferrugineum · P. buxifolium · P. cacondense · P. calcicola · P. callicarpeum · P. campbelli · P. campbellii · P. capense · P. capitatum · P. cardiocarpum · P. cauliflorum f. cauliflorum · P. cauliflorum f. pedicellatum · P. cavaleriei · P. chathamicum · P. chatterjeeanum · P. cheesmaniae · P. chelidospermum · P. chichijimense · P. chinense · P. clementis · P. coccineum
Accessed through GBIF Data Portal March 18, 2008:
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