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FOC | Family List | FOC Vol. 16 | Boraginaceae

2. Ehretia P. Browne, Civ. Nat. Hist. Jamaica. 168. 1756.

厚壳树属 hou ke shu shu

Trees or shrubs. Leaves petiolate, entire or serrate at margin. Inflorescences corymbose or paniculate-cymose. Calyx 5- lobed. Corolla white or pale yellow, tubular or tubular-campanulate, rarely funnelform, 5-lobed; lobes spreading or reflexed. Filaments usually exserted; anthers ovate to oblong or linear. Ovary ovoid, 2-loculed, each locule with 2 ovules. Style terminal, 2-cleft; stigmas 2, capitate or elongated. Drupes yellow, orange, or pale red, subglobose, glabrous, endocarp divided at maturity into 2 2-seeded or 4 1-seeded pyrenes.

About 50 species: mostly in Africa and S Asia, three in North America and the Caribbean; 14 species in China, mainly S of the Chang Jiang.


1 Leaves serrate; endocarp divided at maturity into 2 2-seeded pyrenes.   (2)
+ Leaves entire; endocarp divided at maturity into 4 1-seeded pyrenes.   (4)
       
2 (1) Leaves glabrous, teeth antrorse, apiculate; corolla lobes longer than tube; drupes 3-4 mm in diam.   1 Ehretia acuminata
+ Leaves pubescent abaxially, teeth spreading, not apiculate; corolla lobes shorter than tube; drupes 6-15 mm in diam.   (3)
       
3 (2) Leaf base cuneate to rotund, blade pubescent adaxially; drupes 10-15 mm in diam.   3 Ehretia dicksonii
+ Leaf base cordate, blade densely tomentose adaxially; drupes 3-4 mm in diam.   2 Ehretia corylifolia
       
4 (1) Corolla lobes longer than tube.   (5)
+ Corolla lobes shorter than tube.   (7)
       
5 (4) Inflorescences and calyx densely yellow-brown pubescent, ebracteate   14 Ehretia laevis
+ Inflorescences glabrous or nearly so, with linear or linear-lanceolate bracts.   (6)
       
6 (5) Petiole tuberculate; leaf blade broadly elliptic to oblong-elliptic, apex obtuse or mucronate; flowers pedicellate   12 Ehretia asperula
+ Petiole smooth; leaf blade lanceolate to oblong-lanceolate, apex acute; flowers sessile   13 Ehretia hainanensis
       
7 (4) Corolla tube cylindric; calyx lobes linear, 5-6 mm.   (8)
+ Corolla tube distinctly wider distally; calyx lobes ovate to oblong, 1.5-3.5 mm.   (9)
       
8 (7) Calyx 4-6 mm; stamens inserted at apex of corolla tube   4 Ehretia resinosa
+ Calyx ca. 3 mm; stamens inserted at middle of corolla tube   5 Ehretia densiflora
       
9 (7) Cymes terminal; corolla funnelform, 5.5-6.5 mm; filaments ca. 1.5 mm   6 Ehretia confinis
+ Cymes terminal and lateral; corolla tube campanulate, 7-11 mm; filaments ca. 3-6 mm.   (10)
       
10 (9) Leaf blade with evident reticulate venation.   (11)
+ Leaf blade with only midvein and lateral veins conspicuous.   (12)
       
11 (10) Inflorescences and calyx obscurely pubescent with glandular hairs   7 Ehretia tsangii
+ Inflorescences and calyx with rust-colored glandular hairs   8 Ehretia dunniana
       
12 (10) Petiole, calyx, and corolla densely rust-colored pubescent   9 Ehretia pingbianensis
+ Petiole and corolla glabrous, calyx ciliate.   (13)
       
13 (12) Corolla 10-11 mm, lobes ovate; filaments 8-10 mm, inserted 3.5-5 mm above base   10 Ehretia longiflora
+ Corolla 6.5-8 mm, lobes oblong-lanceolate; filaments 2.5-3 mm, inserted just below throat   11 Ehretia changjiangensis

  • List of lower taxa


     

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