150 ANGIOSPERMAE—DICOTYLEDONES 



automatic self-pollination to take place in open flowers, as well as pseudoclei- 

 stogamously in closed ones during bad weather. 



Wamstorf describes the pollen-grains as resembling those of the last species, 

 but rather larger, i.e. about 35 yu, long and 22 jx. broad. 



621. Calonyction Choisy. 

 Darwin describes the flowers as self-sterile. 



622. Dichondra Forst. 



2021. D. repens Forst. — The flowers of this species are inconspicuous, green, 

 and sometimes cleistogamous (Justs bot. Jahresb., Leipzig, xix, (1891) 1894, p. 424). 



623. Mina Cerv. 



2022. M. lobata Cerv. (Mattel, Nuovo Giorn. bot. ital., Firenze, xxii, 1890, 

 pp. 290-5.) — Mattel describes the flowers of this species as adapted to cross- 

 pollination by birds. 



624. Quamoclit Tourn. 

 Species of this genus are ornithophilous. 



LXXIII. ORDER SOLANACEAE JUSS. 



Literature. — Knuth, ' Bl. u. Insekt. a. d. nordfr. Ins.,' p. 106; R. von 

 Wettstein, ' Solanaceae,' in Engler and Prantl's ' D. nat. Pflanzenfam.,' IV, 3 b, p. 8. 



Flowers partly belong to class Po (Solanum), partly to C (Lycium), Hh 

 (Atropa, Scopolia), and L. (Nicotiana). Nectar is secreted below the ovary. The 

 flowers are protogynous or homogamous, and crossing is usually secured or favoured 

 by the projection of the stigma, while automatic self-pollination is generally rendered 

 possible towards the end of anthesis by alteration in position of the reproductive 

 organs or the flowers themselves. 



625. Lycium L. 



Flowers homogamous ; with concealed nectar, secreted by the ovary, and stored 

 in the base of the corolla-tube. 



2023. L. vnlgare Dun. ( = L. barbarum Z.). (Herm. Miiller, 'Fertilisation,' 

 pp. 426-7, ' Weit. Beob.,' Ill, pp. 23-4; Kirchner, 'Flora v. Stuttgart,' p. 565; 

 Knuth, ' Bl. u. Insekt. a. d. nordfr. Ins.,' pp. 108-9, 164: 'Weit. Beob. u. Bl. 

 u. Insekt. a. d. nordfr. Ins.,' p. 238; Kerner, 'Nat. Hist. PI.,' Eng. Ed. i, II, 

 p. 366.) — In this species the lighter throat of the dull-violet corolla is marked with 

 dark-violet lines serving as nectar-guides. The corolla-tube is 7-10 mm. long, and 

 its upper end broadens like a funnel, afterwards passing into a limb 16-22 mm. in 

 diameter. The inside is smooth, but the throat is lined with thick woolly hairs 

 which protect the nectar against rain and unbidden guests. The stigma and 

 stamens mature simultaneously, and the filaments and style are usually of the 

 same length, but the latter may be bent upwards so as to take the stigma away 

 from the anthers. As a rule, however, it is in immediate contact with them, so that 



