58 



CRUCIPER^. (mustard FAMILY.) 



forming a cross. Stamens 6, 2 of them shorter, and inserted 

 lower down, (rarely 4 or 2). Ovary consisting of two coalesced 

 carpels, 2-, i*are]y 1-celled ; style and stigma entire, or 2-lobed. 



Fig. 14 



Fi?, 14. (a) Flower of Mustard, enlarged, (b) The tetradynamous stamens, also 

 enlarged, (c) Siliques of Arabis turrita, L., one of them with the valve gone, showing the 

 seeds suspended from the marginal placenta?, (rf) A seed cut crosswise, much enlarged, 

 showing the accumbent cotyledons, and the wing around the seed, (e) The embryo (/) A 

 flower of Matthiola, (g) Its tetradynamous stamens, enlarged, (h) A raceme of Draba. (?) 

 A silicle of the same, cut across, showing the partition, and seeds suspended from marginal 

 placenta?. (;) One of the seeds cut across, much enlarged, showing the incumbent 

 cotyledons. 



Suborder I. SILiIQUOStE. Pods siliques, linear, r^r oblong (except in ^nastatica 

 II, Savignya 94, and Carrichtera 25), dehiscent for their whole length, or all except the apex 

 (except in Andreoskia). Valves parallel to septum, and equalling it in breadth. 



Tribe I. ARABIDEJE. Seeds orbicular or oval, in one row (except in Nasturtium 

 5, Nasturtiopsis 4, and Arabis 6). Cotyledons accumbent (in Nasturtiopsis 4, incumbent). 

 * JVot desert plants. 



1. MATTHIOLA. 1^ Woolly herbs. Flowers pinkish-purple, yellow, or livid. Pods 



flattened, often 2-homed. 



2. CHEIRANTHUS. 71 Canescent, shrubby plants. Flowers large, yellow. Pods 4-angled. 



3. NASTURTIUM. 1^ Glabrous or glabrescent herbs. Flowers white. Pods linear, or ob 



Ion?, turgid. Seeds in 2 rows, 

 5. BARBAREA. If!® Glabrous herbs ; stems 4-angled. Flowers yellow. Pods 4-angled. 



