314 



NATURAL HISTORY OF PLANTS. 



suffice to distinguish a section, and that not well-defined, in this 

 enormous genus. 1 



Crassula, 2 as thus defined, includes some hundred and fifty species. 3 

 Those belonging to Til/tea are cosmopolitan. The others are chiefly 

 found in South Africa, and some in Abyssinia and the mountains of 

 India. They are herbs, sometimes annual, more rarely shrubs, with 

 opposite or alternate exstipulate fleshy leaves, which, like the stems 

 vary greatly in form ; so that the aspect of these succulent plants 

 is very variable. The flowers 4 form ramified corymbiform cymes, 

 usually terminal sometimes corymbiform or capituliform. 



This order was made by B. de Jussieu 5 to contain, under the name 

 of Sempervivece, the then known genera of Cra-s-stdacece which we have 

 just been through, besides most of those now referred to Saxifragece, 

 Portulacacece, and Droseracece, together with Cuscuta, Samolus, 

 Forskalea, &c, thus forming a very heterogeneous group. Adanson 6 



1 The possession of unguiculate petals has also 

 been given as characteristic of Dinacria, but they 

 only taper gradually from above downwards. 



2 The limits of the sections are, as a rule, ill- 

 defined ; however, the following may be dis- 

 tinguished in practice : 1. Eucrasmla. Petals 

 spreading or reflexed, not tapering upwards, often 

 mucronulate. [DC, PI. Gr., t. 19, 21, 37, 79, 

 103. — Cambess., iu Jacquem. Voy., Pot., t. 73 

 (Larochea Pees., Enchir., i. 337 (part.). — 

 Pochea, sect. Danielia DC, Prodr., iii. 3'j3. — 

 Kalosanthes Haw., Pevis. Sure, (part.), 5, 6. — 

 Turgosea Haw., loc. cit., 14. — Curtogyne Haw., 

 loc. cit., 8.— Ecel. & Zeth., Enum., 303. — 

 Sarcolipes Eckl. & Zeth., loc. cit., 290. — 

 Petrogeton Ecel. & Zeth., loc. cit., 291. — 

 Tetraphyle Eckl. & Zeth., loc. cit., 292. — 

 Pyrgosea Eckl. & Zeth., loc. cit., 298. — This- 

 antha Eckl. & Zeth., loc. cit., 302.] — 2. Gram- 

 tnanthes (DC). Calyx campanulate, nearly equal 

 to tube of corolla. (Pltjken., Amalth., t. 115, 

 fig. 6.— Haev. & SOND., Fl. Cap., iii. 331.)— 3. 

 Pochea (DC, part.). Calyx shorter than tube of 

 corolla, which consists of pieces sticking to one 

 another and to the stamens, but seldom truly 

 gamopetalous (see above, p. 312, note 4). — 4. 

 Dinacria (Haby.). Petals long-tapering at base. 

 Carpels possessing a dorsal horn. Leaves oppo- 

 site. (See above, p. 313, note 4.) — 5. Pyramidella 

 (B. H.). Petals elongated, long-tapering, cana- 

 liculate at apex. Leaves imbricate, 4-stichous 



[Tetrapliyle Eckl. & Zeth., Enum., 292 (part)]. 

 — 6. Sphceritis [Eckl. & Zeth., loc. cit., 299 

 (parr.) ;— DC, PI. Gr., t. 7]. Petals panduri- 

 fcrm, gradually tapering and canaliculate at 

 apex. — 7. Margarella (13. H.). Petals panduri- 

 forxn, attenuate tapering abruptly into a glandular 

 canaliculate inucro [Spheeritis Eckl. & Zeyh. 

 (part.), loc. cit.~\. — 8. Pachyacris (B. H.). Petals 

 lanceolate, at apex thickened glandular, 3-quetrous 

 [Spheeritis (part.) Eckl. & Zeth.]. — 9. Globulea 

 (Haw., Syn., 60 ; Pevis., 17 ; — DC, PI. Gr., t. 

 61, 133; Prodr., iii. 390 ;— Pot. Mag.,t. 1940). 

 Petals panduriform, bearing a gland below obtuse 

 apex. Undershrubs with approximated or rosu- 

 late leaves ; floriferous branches leafless. — 10. 

 Eutillcea. Flowers 3-5-merous. Calyx equal to 

 corolla or shorter. (See above, p. 313, notes 1, 

 2, figs. 348-353.)— 11. Pulliarda (DC). Flowers 

 usually 4-merous. Glands linear. Follicles many- 

 seeded. — 12. Disporocarpaa (C A. Met.) Petals 

 sticking together at base. Glands very small. 

 Ovules usually 2 in each carpel. — 13. Helo- 

 phyllum (Eckl. & Zeth., Enum., 288). Glands 

 cuneiform truncate. Carpels usually 1-ovulate. 

 (Haet. & Sond., Fl. Cap., ii. 328.) 



3 Walp., Pep., ii. 251 (TilltBa), 252 ; v. 791 ; 

 Ann., i. 322; ii. 666, 667; vii. 916. 



4 White, pink, red, or crimson, more rarely 

 yellow or orange. 



5 Ord. Nat. (1759), in A. L. Juss. Gen., lxix. 



6 Fam. des PI., ii. (1763), 13, 346, fam. xxxiii. 



