368 TRANS. ST. LOUIS ACAD. SCIENCE. 



CEANOTHUS, L. — Shrubs, or occasionally arborescent, spinose or 

 unarmed, with alternate or opposite pinnatelj veined or 3-nerved leaves, 

 and small but showy white or blue flowers in often long-peduncled and 

 dense axillary or terminal clusters. — Gen. No. 267; Gray, Gen. ii. iSi, pi. 

 T69; Benth. Si Hook., Gen. i. 37S ; Watson, Proc. Amer. Acad. x. 333; 

 Trelease, Proc. Calif. Acad. 2 ser. i. 106; Parry, Proc. Davenport Acad. 

 V. 162. 



This exclusively North American genus is represented in Mexico by 3 

 well-marked species, our flora including, according to my opinion when 

 my pieliminary synoptical list was published, 32 species. Dr. Parry, re- 

 ducing some of these, and adding several others, makes 30 for our region. 



COLUBRINA, Richard. — Shrubs or trees, with rigidly divaricate but 

 scarcely spinose branches, alternate pinnately veined or 3-nerved leaves. 

 and tomentose flowers in axillary umbel-like clusters. — Brongn. Ann. Sc. 

 Nat. X. 368; Grisebach, Fl. Brit. W. Ind. 100; Benth. & Hook. Gen. i. 

 379. — About 10 species, belonging to the warmer parts of America, with a 

 single exception. 



* Leaves usually rather small, somewhat toothed (at least some of them), more or less 



3-nerved ; common peduncle very short or wanting ; calyx segments tardily and incom - 

 pletely deciduous; fruit short-beaked by the persistent style. 



1. C. Texensis, Gray. — Shrub as much as 15 ft. high ; branches mostly 

 rigidly divaricate, terete, gray-tomentose or soon glabrate and glaucous ; 

 leaves usually less than i in. long, pubescent or ultimately glabrate, ellipti- 

 cal to spatulate-obovate, subcuneate to more or less rounded at base, obtuse 

 to acute or mucronate, glandular-denticulate ; fruit 8 mm. in diameter, the 

 recurved pedicels of equal or greater length.— PI. Lindheimer. (1850), 169; 

 Watson, Index, 167. RhamnHs{}) Texensis, Torr. .i: Gr., Fl. (1838) i. 

 263. Condalia obovata. Gray, Hall, PI. Tex. 5! — Texas and Mexico. — In 

 one of Lindheimer's specimens, and in Drummond Nos. 67 and 652, 

 the leaves are broadly oval and as much as 2 in. long. — A citation of dou- 

 ble authority makes C. Texensis (Torr. iv: Gr.)Gray. 



* * Leaves ample, entire, not at all 3.nerved; common peduncle evident; calyx segments 



soon falling; styles deciduous at base. 



2. C. RECLiNATA, Brongn. — Large tree, the old trunks deeply fissured; 

 twigs less divaricate, sulcate, soon glabrous, with numerous small lenti- 

 cels; leaves slender-petioled, inch and a half to 3 in. long, at length gla- 

 brate, elliptical or ovate to lanceolate, mostly blunt-acuminate, with a few 

 conspicuous submarginal (nectar?) glands; inflorescence becoming gla- 

 brous ; fruit 6 to 8 mm. in diameter, on pedicels of equal or greater length. 

 — I.e. (1826) 369; Sargent, Forest Trees, 41. Ceanothiis reclinatus., 

 L'Her, Sert. (178S), 6. Rha7nnus ellipticus., Ait. Hort. Kew. (1789) i. 

 265. Zizyphus Domingensis., Nouv. Duhamel (1806), iii. 56. — South Flo- 

 rida, especially on Umbrella Key, from the West Indies. — The name may 

 be written by some C. reclinata (L'Her.) Brongn. 



